NEW YORK (AP) — Everybody looks forward to weekends. This year, stock investors should embrace Tuesdays as well.

That's because the Dow Jones industrial average has risen every Tuesday going back to Jan. 18. That's 17 straight weeks, a streak that includes yesterday, when the Dow closed above 15,000 for the first time. During the Tuesday streak, the average gain for the Dow has been 0.52 percent.

Only Wednesday has seen a better run on Wall Street -- 45 years ago in 1968 when the blue-chip index saw increases for 24 weeks in a row, according to Schaeffer's Investment Research.

Part of the reason for Tuesdays' success is simple math. The Dow has climbed on 64 percent of its trading days so far this year. It also follows Monday, statistically a weak day, which has seen the average losing an average of 0.22 percent.