| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 317 | 66 |
| 2014 | 414 | 64 |
| 2013 | 425 | 65 |
| 2012 | 325 | 70 |
| 2011 | 155 | 86 |
| 2010 | 315 | 64 |
| 2009 | 270 | 65 |
| 2008 | 253 | 71 |
| 2007 | 199 | 71 |
| 2006 | 156 | 71 |
| 2005 | 128 | 71 |
| 2004 | 107 | 70 |
| 2003 | 87 | 71 |
| 2002 | 70 | 73 |
| 2001 | 57 | 81 |
| 2000 | 53 | 78 |
| 1999 | 52 | 74 |
| 1998 | 57 | 73 |
| 1997 | 67 | 70 |
| 1996 | 67 | 69 |
| 1995 | 57 | 72 |
| 1994 | 75 | 60 |
| 1993 | 97 | 56 |
| 1992 | 86 | 56 |
| 1991 | 98 | 49 |
| 1990 | 90 | 56 |