| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 349 | 12 |
| 2015 | 55.9 | 43 |
| 2014 | 197.5 | 20 |
| 2013 | 106.5 | 29 |
| 2012 | 5.5 | 119 |
| 2011 | -8.5 | 191 |
| 2010 | 74.4 | 41 |
| 2009 | 122.3 | 27 |
| 2008 | 246.2 | 19 |
| 2007 | 216.3 | 30 |
| 2006 | -24 | 194 |
| 2005 | 54.6 | 39 |
| 2004 | 75.3 | 20 |
| 2003 | 87.7 | 18 |
| 2002 | 115.6 | 16 |
| 2001 | 49.3 | 27 |
| 2000 | 106.9 | 21 |
| 1999 | 123.1 | 18 |
| 1998 | 32.7 | 31 |
| 1997 | 32 | 29 |
| 1996 | 2.1 | 72 |
| 1995 | 0.4 | 110 |
| 1994 | 9.1 | 37 |
| 1993 | 1.2 | 71 |
| 1992 | 27.6 | 13 |
| 1991 | 12.9 | 25 |
| 1990 | 17.8 | 20 |
| 1989 | -10.4 | 147 |
| 1988 | -4.8 | 144 |
| 1987 | 11.6 | 16 |
| 1986 | 2.3 | 30 |