| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 174.6 | 100 |
| 2015 | 162.4 | 114 |
| 2014 | 151.3 | 122 |
| 2013 | 136.8 | 127 |
| 2012 | 113.9 | 135 |
| 2011 | 87.4 | 143 |
| 2010 | 73.1 | 143 |
| 2009 | 63.7 | 144 |
| 2008 | 61.1 | 146 |
| 2007 | 47.9 | 146 |
| 2006 | 36.4 | 148 |
| 2005 | 30.7 | 148 |
| 2004 | 27.5 | 149 |
| 2003 | 21.7 | 149 |
| 2002 | 18.9 | 148 |
| 2001 | 19.3 | 141 |
| 2000 | 19.8 | 140 |
| 1999 | 15.8 | 146 |
| 1998 | 14.3 | 150 |
| 1997 | 20.5 | 140 |
| 1996 | 22.2 | 139 |
| 1995 | 20.1 | 138 |
| 1994 | 17.7 | 132 |
| 1993 | 14.6 | 135 |
| 1992 | 12.4 | 139 |
| 1991 | 11.5 | 138 |
| 1990 | 9.8 | 135 |
| 1989 | 8.6 | 118 |
| 1988 | 7.1 | 116 |
| 1987 | 11.7 | 112 |
| 1986 | 18.5 | 100 |