The Dow Jones industrial average closed above 15,000 Tuesday for the first time. It's been six years since the Dow closed above 14,000 for the first time.

Here's a look at the previous times that the Dow first closed above round-number levels, measured in increments of 1,000 points.

First close above:

15,000 points: May 7, 2013

14,000 points: July 19, 2007

13,000 points: April 25, 2007

12,000 points: October 19, 2006

11,000 points: May 3, 1999

10,000 points: March 29, 1999

9,000 points: April 6, 1998

8,000 points: July 16, 1997

7,000 points: February 13, 1997

6,000 points: October 14, 1996

5,000 points: November 21, 1995

4,000 points: February 23, 1995

3,000 points: April 17, 1991

2,000 points: January 8, 1987

1,000 points: November 14, 1972

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Source: S&P Dow Jones Indices