| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 188.6 | 97 |
| 2015 | 185.2 | 110 |
| 2014 | 184.2 | 110 |
| 2013 | 181.7 | 112 |
| 2012 | 167.6 | 115 |
| 2011 | 150.6 | 118 |
| 2010 | 119.2 | 119 |
| 2009 | 99.3 | 127 |
| 2008 | 55.9 | 148 |
| 2007 | 57.5 | 140 |
| 2006 | 60.4 | 136 |
| 2005 | 62.7 | 129 |
| 2004 | 62.2 | 124 |
| 2003 | 60.5 | 115 |
| 2002 | 65.4 | 110 |
| 2001 | 66.4 | 104 |
| 2000 | 65.4 | 103 |
| 1999 | 65.9 | 100 |
| 1998 | 65.1 | 99 |
| 1997 | 91.3 | 89 |
| 1996 | 85.4 | 90 |
| 1995 | 73 | 90 |
| 1994 | 70.2 | 84 |
| 1993 | 66.8 | 86 |
| 1992 | 73.8 | 83 |
| 1991 | 89.3 | 77 |
| 1990 | 87.8 | 75 |
| 1989 | 81.5 | 67 |
| 1988 | 75.5 | 69 |
| 1987 | 65.6 | 71 |
| 1986 | 60.6 | 70 |