| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | -277.3 | 76 |
| 2015 | 51.8 | 44 |
| 2014 | 17.2 | 78 |
| 2013 | 4.5 | 113 |
| 2012 | 52.2 | 45 |
| 2011 | 229.7 | 20 |
| 2010 | -220.1 | 196 |
| 2009 | 142.9 | 22 |
| 2008 | 63.1 | 48 |
| 2007 | 688.9 | 10 |
| 2006 | 105 | 33 |
| 2005 | 812.9 | 6 |
| 2004 | 38.9 | 37 |
| 2003 | 71 | 20 |
| 2002 | 3.2 | 81 |
| 2001 | 59.1 | 22 |
| 2000 | 85.3 | 24 |
| 1999 | 30.1 | 33 |
| 1998 | 46.4 | 24 |
| 1997 | 26.2 | 35 |
| 1996 | 44.1 | 19 |
| 1995 | 19 | 30 |
| 1994 | 21.2 | 23 |
| 1993 | 11.3 | 29 |
| 1992 | 14.4 | 21 |
| 1991 | 3.6 | 37 |
| 1990 | 6.5 | 32 |
| 1989 | 5.9 | 32 |
| 1988 | 4.4 | 28 |
| 1987 | 4.1 | 25 |
| 1986 | 1.9 | 32 |