| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 249 | 23 |
| 2015 | 232 | 26 |
| 2014 | 214 | 28 |
| 2013 | 196 | 30 |
| 2012 | 192 | 29 |
| 2011 | 132 | 39 |
| 2010 | 124 | 36 |
| 2009 | 149 | 29 |
| 2008 | 122 | 35 |
| 2007 | 83 | 40 |
| 2006 | 65 | 40 |
| 2005 | 51 | 43 |
| 2004 | 39 | 52 |
| 2003 | 32 | 55 |
| 2002 | 30 | 53 |
| 2001 | 35 | 48 |
| 2000 | 37 | 49 |
| 1999 | 35 | 51 |
| 1998 | 38 | 51 |
| 1997 | 46 | 41 |
| 1996 | 44 | 44 |
| 1995 | 40 | 48 |
| 1994 | 37 | 44 |
| 1993 | 53 | 30 |
| 1992 | 67 | 27 |
| 1991 | 79 | 23 |
| 1990 | 60 | 32 |
| 1989 | 56 | 30 |
| 1988 | 53 | 30 |
| 1987 | 52 | 28 |
| 1986 | 50 | 25 |