A chronology of changes in the prime rate going back to 1972. The dates reflect when the prime rate change took effect. For example, the increases announced Tuesday will take effect on Wednesday, May 17.

2000

9.50 percent _ May 17

9 percent _ March 22

8.75 percent _ Feb. 3

1999

8.50 percent _ Nov. 16

8.25 percent _ Aug. 24

8 percent _ June 30

1998

7.75 percent _ Nov. 18

8.00 percent _ Oct. 16

8.25 percent _ Sept. 30

1997

8.50 percent _ March 26

1996

8.25 percent _ Feb. 1

1995

8.50 percent _ Dec. 20

8.75 percent _ July 7

9 percent _ Feb. 1

1994

8.50 percent _ Nov. 15

7.75 percent _ Aug. 16

7.25 percent _ May 17

6.75 percent _ April 18

6.25 percent _ March 23

1993

5.5 percent _ Oct. 18 (Morgan Guaranty first, nobody else significant followed. Morgan pushed it back up to 6 percent on March 17, 1994)

1992

6 percent _ July 2

6.25 percent _ April 20 (Chemical Banking Corp. only, rescinded June 5)

1991

6.5 percent _ Dec. 20

7.5 percent _ Nov. 6

8 percent _ Sept. 13

8.5 percent _ May 1

9 percent _ Feb. 1

9.5 percent _ Jan. 2

1990

10 percent _ Jan. 8

1989

10.5 percent _ July 10 and July 31

11 percent _ June 5

11.5 percent _ Feb. 24

11 percent _ Feb. 10

1988

10.5 percent _ Nov. 28

10.0 percent _ Aug. 11

9.5 percent _ July 14

9 percent _ May 11

8.5 percent _ Feb. 2

1987

8.75 percent _ Nov. 5

9.0 percent _ Oct. 22

9.25 percent _ Oct. 7

8.75 percent _ Sept. 4

8.25 percent _ May 15

8.0 percent _ May 1

7.75 percent _ March 31

1986

7.5 percent _ Aug. 26

8.0 percent _ July 11

8.5 percent _ April 21

9.0 percent _ March 7

1985

9.5 percent _ June 18

10.0 percent _ May 20

10.5 percent _ Jan. 15

1984

10.75 percent _ Dec. 20

11.25 percent _ Nov. 28

11.75 percent _ Nov. 8

12.0 percent _ Oct. 26

12.25 percent _ Oct. 16

12.75 percent _ Sept. 27

13.0 percent _ June 25

12.5 percent _ May 8

12.0 percent _ April 6

11.5 percent _ March 19

1983

11.0 percent _ Aug. 8

10.5 percent _ Feb. 28

11.0 percent _ Jan. 11

1982

11.5 percent _ Nov. 22

12.0 percent _ Oct. 13

13.0 percent _ Oct. 7

13.5 percent _ Aug. 20

14.0 percent _ Aug. 18

14.5 percent _ Aug. 16

15.0 percent _ Aug. 2

15.5 percent _ July 29

16.0 percent _ July 20

16.5 percent _ Feb. 23

17.0 percent _ Feb. 17

16.5 percent _ Feb. 2

1981

15.75 percent _ Dec 1

16.0 percent _ Nov. 24

16.5 percent _ Nov. 16

17.0 percent _ Nov. 9

17.5 percent _ Nov. 2

18.0 percent _ Oct. 13

19.0 percent _ Oct. 5

19.5 percent _ Sept. 22

20.0 percent _ Sept. 15

20.5 percent _ July 8

20.0 percent _ June 2

20.5 percent _ May 22

20.0 percent _ May 19

19.5 percent _ May 11

19.0 percent _ May 4

18.0 percent _ April 29

17.5 percent _ April 21

17.0 percent _ March 25

17.5 percent _ March 17

18.0 percent _ March 10

18.5 percent _ Feb. 24

19.0 percent _ Feb. 23

19.5 percent _ Feb. 3

20.0 percent _ Jan. 9

1980

21.5 percent _ Dec. 19

21.0 percent _ Dec. 16

20.0 percent _ Dec. 10

19.0 percent _ Dec. 5

18.5 percent _ Dec. 2

17.75 percent _ Nov. 26

17.0 percent _ Nov. 21

16.25 percent _ Nov. 17

15.5 percent _ Nov. 6

14.5 percent _ Oct. 29

14.0 percent _ Oct. 17

13.5 percent _ Oct. 1

13.0 percent _ Sept. 26

12.5 percent _ Sept. 19

12.25 percent _ Sept. 12

12.0 percent _ Sept. 5

11.0 percent _ July 24

11.5 percent _ July 7

12.0 percent _ June 20

12.5 percent _ June 13 13.0 percent _ June 6

14.0 percent _ May 30

14.5 percent _ May 27

16.5 percent _ May 16

17.5 percent _ May 7

18.5 percent _ May 2

19.5 percent _ April 18

20.0 percent _ April 3

19.5 percent _ April 1

19.0 percent _ March 19

18.5 percent _ March 14

17.75 percent _ March 7

17.25 percent _ March 4

16.75 percent _ Feb. 29

16.5 percent _ Feb. 26

15.75 percent _ Feb. 19

1979

15.25 percent _ Dec. 7

15.5 percent _ Nov. 30

15.75 percent _ Nov. 16

15.5 percent _ Nov. 9

15.25 percent _ Nov. 1

15.0 percent _ Oct. 23

14.5 percent _ Oct. 9

13.5 percent _ Sept. 28

13.25 percent _ Sept. 21

13.0 percent _ Sept. 14

12.75 percent _ Sept. 7

12.25 percent _ Aug. 28

12.0 percent _ Aug. 16

11.75 percent _ July 27

11.5 percent _ June 19

1978

11.75 percent _ Dec. 26

11.5 percent _ Nov. 24

11.0 percent _ Nov. 17

10.75 percent _ Nov. 6

10.5 percent _ Nov. 1

10.25 percent _ Oct. 27

10.0 percent _ Oct. 13

9.75 percent _ Sept. 28

9.5 percent _ Sept. 15

9.25 percent _ Aug. 31

9.0 percent _ June 30

8.75 percent _ June 16

8.5 percent _ May 26

8.25 percent _ May 5

8.0 percent _ Jan. 10

1977

7.75 percent _ Oct. 24

7.5 percent _ Oct. 7

7.25 percent _ Sept. 16

7.0 percent _ Aug. 22

6.75 percent _ May 31

6.5 percent _ May 13

1976

6.25 percent _ Dec. 13

6.5 percent _ Nov. 1

6.75 percent _ Oct. 4

7.0 percent _ Aug. 2

7.25 percent _ June 7

7.0 percent _ June 1

6.75 percent _ Jan. 21

7 percent _ Jan. 12

1975

7.25 percent _ Dec. 2

7.5 percent _ Nov. 5

7.25 percent _ Oct. 27

8 percent _ Sept. 15

7.75 percent _ Aug. 12

7.5 percent _ July 28

7.25 percent _ July 18

7 percent _ June 9

7.25 percent _ May 20

7.5 percent _ March 24

7.75 percent _ March 18

8 percent _ March 10

8.25 percent _ March 5

8.5 percent _ Feb. 24

8.25 percent _ Feb. 18

9 percent _ Feb. 10

9.25 percent _ Feb. 3

9.5 percent _ Jan 28

9.25 percent _ Jan. 20

10 percent _ Jan. 15

10.25 percent _ Jan. 9

1974

10.5 percent _ Nov. 25

10.75 percent _ Nov. 14

11 percent _ Nov. 4

11.25 percent _ Oct. 28

11.5 percent _ Oct. 21

11.75 percent _ Oct. 7

12 percent _ July 5

11.75 percent _ June 26

11.5 percent _ May 17

11.25 percent _ May 10

11 percent _ May 6

10.75 percent _ May 2

10.5 percent _ April 25

10.25 percent _ April 19

10 percent _ April 11

9.75 percent _ April 5

9.5 percent _ April 3

9.25 percent _ March 29

9 percent _ March 22

8.75 percent Feb. 25

9 percent _ Feb. 19

9.25 percent _ Feb. 11

9.5 percent _ Jan. 29

1973

9.75 percent _ Oct. 24

10 percent _ Sept. 18

9.75 percent _ Aug. 28

9.5 percent _ Aug. 22

9.25 percent _ Aug. 13

9 percent _ Aug. 6

8.75 percent _ July 30

8.5 percent _ July 18

8.25 percent _ July 9

8 percent _ July 3

7.75 percent _ June 25

7.5 percent _ June 8

7.25 percent _ May 25

7 percent _ May 7

6.75 percent _ April 18

6.5 percent _ March 26

6.25 percent _ Feb. 27

1972

6 percent _ Dec. 27

5.75 percent _ Oct. 4

5.25 percent _ June 26

5.5 percent _ April 29

5 percent _ April 5

4.75 percent _ Jan. 31

5 percent _ Jan. 24