| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 208.9 | 95 |
| 2015 | 188.5 | 109 |
| 2014 | 175.1 | 113 |
| 2013 | 162.5 | 116 |
| 2012 | 147.2 | 121 |
| 2011 | 135.2 | 123 |
| 2010 | 118.5 | 122 |
| 2009 | 111 | 119 |
| 2008 | 105.8 | 124 |
| 2007 | 93 | 121 |
| 2006 | 78.1 | 122 |
| 2005 | 68.4 | 123 |
| 2004 | 57.3 | 128 |
| 2003 | 51.3 | 126 |
| 2002 | 46.6 | 121 |
| 2001 | 43.3 | 121 |
| 2000 | 40.9 | 123 |
| 1999 | 39.8 | 122 |
| 1998 | 35.3 | 129 |
| 1997 | 38.5 | 127 |
| 1996 | 41.5 | 119 |
| 1995 | 39.7 | 116 |
| 1994 | 31.5 | 121 |
| 1993 | 29.5 | 117 |