The Dow Jones fell 213 points on Tuesday, closing at 12,715.93, marking its biggest drop of 2012. The drop marked the stock market’s third triple-digit loss in just four days. Investors have been jittery over the never-ending European debt crisis and underwhelming corporate earnings reports. The market has lost about 550 points over the last week after climbing above 13,000 in March. The market had rallied at the beginning of the year, posting the best gains since before the financial crisis hit in fall 2008.