| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 222.2 | 93 |
| 2015 | 215.3 | 105 |
| 2014 | 252.9 | 104 |
| 2013 | 246 | 104 |
| 2012 | 226.9 | 107 |
| 2011 | 218.4 | 106 |
| 2010 | 182.5 | 107 |
| 2009 | 186.8 | 100 |
| 2008 | 251.4 | 96 |
| 2007 | 242.1 | 89 |
| 2006 | 186.8 | 94 |
| 2005 | 147.2 | 96 |
| 2004 | 130.1 | 96 |
| 2003 | 106.7 | 96 |
| 2002 | 78.7 | 102 |
| 2001 | 64.9 | 106 |
| 2000 | 58.7 | 110 |
| 1999 | 59.8 | 106 |
| 1998 | 61.6 | 103 |
| 1997 | 56 | 104 |
| 1996 | 52.4 | 105 |
| 1995 | 47 | 107 |