SPX drop almost 40 points (2%)

S&P 500 (SPX) dropped almost 40 points (39.40), 2% on 31-July.  There are only 4 such big drop in 2014:

1. 24-Jan (38.17 points)
2. 3-Feb (40.70)
3. 10-Apr (39.35)
4. 31-Jul (39.40)