| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 10 | 115 |
| 2014 | 11 | 122 |
| 2013 | 9 | 130 |
| 2012 | 7 | 137 |
| 2011 | 8 | 133 |
| 2010 | 7 | 128 |
| 2009 | 6 | 132 |
| 2008 | 6 | 135 |
| 2007 | 5 | 130 |
| 2006 | 4 | 129 |
| 2005 | 4 | 132 |
| 2004 | 4 | 118 |
| 2003 | 3 | 123 |
| 2002 | 2 | 125 |
| 2001 | 3 | 114 |
| 2000 | 3 | 111 |
| 1999 | 4 | 100 |
| 1998 | 4 | 92 |
| 1997 | 5 | 89 |
| 1996 | 6 | 86 |
| 1995 | 5 | 80 |
| 1994 | 5 | 80 |
| 1993 | 5 | 79 |
| 1992 | 5 | 74 |
| 1991 | 4 | 72 |
| 1990 | 3 | 81 |