| 年份 | 分类 | 数值 | 
		| 2000 | United States : million dollars | 247,343.10 | 
		| 2001 | United States : million dollars | 249,410.50 | 
		| 2002 | United States : million dollars | 259,766.90 | 
		| 2003 | United States : million dollars | 270,119.20 | 
		| 2004 | United States : million dollars | 298,002.80 | 
		| 2005 | United States : million dollars | 326,506.00 | 
		| 2006 | United States : million dollars | 343,702.60 | 
		| 2007 | United States : million dollars | 363,583.10 | 
		| 2008 | United States : million dollars | 353,289.30 | 
		| 2009 | United States : million dollars | 368,918.10 | 
		| 2010 | United States : million dollars | 371,049.10 | 
		| 2011 | United States : million dollars | 363,687.50 | 
		| 2012 | United States : million dollars | 375,057.80 | 
		| 2013 | United States : million dollars | 393,096.40 | 
		| 2014 | United States : million dollars | 391,341.50 | 
		| 2015 | United States : million dollars | 381,434.60 |