| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 104.8 | 113 |
| 2015 | 113.9 | 130 |
| 2014 | 117.8 | 134 |
| 2013 | 113.3 | 137 |
| 2012 | 107.5 | 137 |
| 2011 | 106.4 | 136 |
| 2010 | 98.9 | 133 |
| 2009 | 83.5 | 135 |
| 2008 | 85.7 | 135 |
| 2007 | 74.8 | 133 |
| 2006 | 62.1 | 134 |
| 2005 | 55.6 | 134 |
| 2004 | 45.7 | 136 |
| 2003 | 39.1 | 135 |
| 2002 | 43 | 126 |
| 2001 | 44.5 | 119 |
| 2000 | 47.7 | 114 |
| 1999 | 48.8 | 112 |
| 1998 | 43.5 | 117 |
| 1997 | 38.7 | 126 |
| 1996 | 34.2 | 130 |
| 1995 | 33.6 | 126 |
| 1994 | 25.6 | 123 |
| 1993 | 23.9 | 123 |
| 1992 | 26.5 | 116 |
| 1991 | 41.4 | 101 |