| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 181 | 41 |
| 2014 | 203 | 40 |
| 2013 | 179 | 41 |
| 2012 | 213 | 38 |
| 2011 | 190 | 40 |
| 2010 | 236 | 34 |
| 2009 | 213 | 34 |
| 2008 | 247 | 34 |
| 2007 | 197 | 34 |
| 2006 | 158 | 35 |
| 2005 | 144 | 33 |
| 2004 | 140 | 30 |
| 2003 | 108 | 32 |
| 2002 | 91 | 32 |
| 2001 | 88 | 32 |
| 2000 | 97 | 29 |
| 1999 | 93 | 29 |
| 1998 | 78 | 29 |
| 1997 | 91 | 26 |
| 1996 | 91 | 26 |
| 1995 | 83 | 26 |
| 1994 | 77 | 23 |
| 1993 | 71 | 21 |
| 1992 | 71 | 21 |
| 1991 | 61 | 21 |
| 1990 | 48 | 22 |
| 1989 | 34 | 25 |
| 1988 | 42 | 20 |
| 1987 | 35 | 20 |
| 1986 | 33 | 17 |