Global stock markets have endured a rough start to 2016. One metric shows just how brutal a year it has been so far.
The S&P Global Broad Market Index, which tracks global stock performance, has lost $2.23 trillion in market value this year. For perspective, the total trumps estimated U.S. student loan debt of more than $1 trillion and would represent roughly 12 percent of U.S. government debt.
Stark drops in Chinese markets, sliding crude oil prices and geopolitical concerns, among other factors, have contributed to selling across the globe.