| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 2419 | 23 |
| 2015 | 2796 | 23 |
| 2014 | 3079 | 22 |
| 2013 | 2697 | 26 |
| 2012 | 2305 | 30 |
| 2011 | 2009 | 32 |
| 2010 | 1845 | 32 |
| 2009 | 479 | 55 |
| 2008 | 526 | 53 |
| 2007 | 437 | 53 |
| 2006 | 376 | 53 |
| 2005 | 263 | 57 |
| 2004 | 204 | 59 |
| 2003 | 135 | 62 |
| 2002 | 120 | 63 |
| 2001 | 108 | 64 |
| 2000 | 98 | 66 |
| 1999 | 93 | 64 |
| 1998 | 84 | 65 |
| 1997 | 75 | 68 |
| 1996 | 69 | 67 |
| 1995 | 60 | 71 |
| 1994 | 49 | 60 |
| 1993 | 35 | 67 |
| 1992 | 55 | 50 |
| 1991 | 60 | 45 |
| 1990 | 68 | 45 |
| 1989 | 56 | 41 |
| 1988 | 58 | 42 |
| 1987 | 62 | 41 |
| 1986 | 62 | 39 |