http://fiatleak.com/ for those who don't know about it.
the last 5 minutes china has bought 700 btc and the U.S has bought 1.7
altho they don't show who sells how much, this is still quite interesting after all the "china bans btc" news we've been hearing.
I believe fiatleak use the data from exchange site, so it is accurate if they don't fake their trades