As shown, the US stock market currently makes up 32.21% of world market cap. This is up 2.53 percentage points since the start of 2011 when the US made up 29.68% of world market cap.
Japan currently has the second biggest stock market at 7.36%, followed by the UK at 6.63% and then China at 6.44%. China has seen its share of world market cap fall the most of any country since the start of 2011. India, which currently makes up 2.52% of world market cap, has seen its share fall the second most behind China since 2011 began.
Interestingly, while it's a G7 country, Italy makes up just 1.05% of world market cap, ranking it 19th overall. All four of the big "emerging market" BRICs (Brazil, Russia, India, China) have bigger stock markets than Italy.
[url=https://servimg.com/view/16199175/12][/url
http://www.bespokeinvest.com/thinkbig/2012/2/8/the-us-gets-bigger-while-china-gets-smaller.html