| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | -151.8 | 74 |
| 2015 | 56.7 | 41 |
| 2014 | 61.5 | 38 |
| 2013 | -2.8 | 186 |
| 2012 | 268.7 | 18 |
| 2011 | 103 | 33 |
| 2010 | 216.3 | 20 |
| 2009 | 86.4 | 30 |
| 2008 | 205.8 | 21 |
| 2007 | 248.1 | 25 |
| 2006 | 118.8 | 31 |
| 2005 | 100.6 | 29 |
| 2004 | 49.2 | 31 |
| 2003 | 41.8 | 29 |
| 2002 | 30.1 | 33 |
| 2001 | 31.9 | 34 |
| 2000 | 83.3 | 25 |
| 1999 | 67.8 | 23 |
| 1998 | 43.5 | 27 |
| 1997 | 38.9 | 25 |
| 1996 | 31.8 | 24 |
| 1995 | 23.9 | 26 |
| 1994 | 27.4 | 19 |
| 1993 | 9.9 | 32 |
| 1992 | -6.7 | 169 |
| 1991 | -4 | 155 |
| 1990 | 10 | 25 |
| 1989 | 15.2 | 20 |
| 1988 | 2.8 | 34 |
| 1987 | 1.9 | 33 |
| 1986 | 10.2 | 16 |