| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 165.8 | 102 |
| 2015 | 164.5 | 113 |
| 2014 | 194 | 109 |
| 2013 | 182.3 | 111 |
| 2012 | 189.6 | 111 |
| 2011 | 171.1 | 112 |
| 2010 | 137.1 | 114 |
| 2009 | 128.3 | 113 |
| 2008 | 166.1 | 108 |
| 2007 | 128.9 | 112 |
| 2006 | 96.2 | 114 |
| 2005 | 75.5 | 120 |
| 2004 | 59.8 | 126 |
| 2003 | 45.7 | 131 |
| 2002 | 38.4 | 132 |
| 2001 | 36.8 | 128 |
| 2000 | 35.7 | 126 |
| 1999 | 33.3 | 130 |
| 1998 | 43.6 | 116 |
| 1997 | 44.4 | 117 |
| 1996 | 36.8 | 129 |
| 1995 | 31.5 | 128 |
| 1994 | 38 | 107 |
| 1993 | 33.7 | 111 |
| 1992 | 48.2 | 96 |
| 1991 | 65.9 | 86 |
| 1990 | 81.7 | 78 |