| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 232.8 | 103 |
| 2014 | 278.1 | 100 |
| 2013 | 290.6 | 96 |
| 2012 | 252.3 | 100 |
| 2011 | 223.5 | 104 |
| 2010 | 190.2 | 104 |
| 2009 | 149.6 | 108 |
| 2008 | 182 | 103 |
| 2007 | 138.6 | 107 |
| 2006 | 118.2 | 105 |
| 2005 | 84.1 | 113 |
| 2004 | 64.5 | 122 |
| 2003 | 54.4 | 122 |
| 2002 | 46.4 | 122 |
| 2001 | 46.9 | 116 |
| 2000 | 40.5 | 125 |
| 1999 | 37.3 | 125 |
| 1998 | 37.9 | 125 |
| 1997 | 44.6 | 116 |
| 1996 | 38.4 | 128 |
| 1995 | 39.4 | 117 |
| 1994 | 36.8 | 110 |