The Dow Jones industrial average just did something it has never done in its 121-year history.
The 30-stock average is now up more than 5,000 points in a year, marking its biggest annual-points gain ever. This following a 200-point rally Monday which sent it to an all-time high.
The Dow was also on track Monday to post 70 record closes in a year for the first time. To put that into perspective, about one of every four trading sessions this year has been a record close for the index.
The Dow, along with the S&P 500 and the Nasdaq composite, has had a banner year, rising 25.6 percent. The S&P 500 and Nasdaq are up 20.3 percent and 28.6 percent, respectively.