We're just at a point where there is neither any great optimism or pessimism in the market, you might as well ask "How many times has the Dow crossed the 15,232 mark?"
My guess is that most investors who like to compare their portfolio to an index use the S&P anyway.
Market watchers like to say "we're in a trading range." Statisticians and physical sciences people refer to it as fluctuation. The truth is we are at 18 [or 17.9, which is exactly the same number] and not trending anywhere, and the "ups and downs" aren't ups and downs at all, just the kind of blips you expect when averaging data with a lot of individual contributions [like the DJIA or the S&P.]