| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | -177.2 | 75 |
| 2015 | 975.8 | 6 |
| 2014 | 203.7 | 18 |
| 2013 | -249.3 | 195 |
| 2012 | 399.4 | 15 |
| 2011 | 207.6 | 21 |
| 2010 | 176.7 | 22 |
| 2009 | 476.6 | 8 |
| 2008 | 29.9 | 60 |
| 2007 | 486.9 | 16 |
| 2006 | 537.6 | 10 |
| 2005 | 26.6 | 52 |
| 2004 | 71 | 22 |
| 2003 | 197.2 | 10 |
| 2002 | 82.6 | 18 |
| 2001 | 97.7 | 16 |
| 2000 | 230.8 | 13 |
| 1999 | 124.3 | 17 |
| 1998 | 96.5 | 15 |
| 1997 | 73.1 | 15 |
| 1996 | 43.7 | 20 |
| 1995 | 41.6 | 19 |
| 1994 | 36.8 | 15 |
| 1993 | 17.1 | 21 |
| 1992 | 11.3 | 25 |
| 1991 | 28.4 | 14 |
| 1990 | 55.4 | 10 |
| 1989 | 25 | 12 |
| 1988 | 4.1 | 29 |
| 1987 | 23.2 | 10 |
| 1986 | 21.2 | 9 |