| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 37.6 | 34 |
| 2015 | 197.8 | 20 |
| 2014 | 251.2 | 14 |
| 2013 | 232.8 | 17 |
| 2012 | 212 | 22 |
| 2011 | 205.6 | 22 |
| 2010 | 152.9 | 24 |
| 2009 | 48.8 | 42 |
| 2008 | 93.2 | 40 |
| 2007 | 69.3 | 45 |
| 2006 | 49.1 | 47 |
| 2005 | 83.4 | 32 |
| 2004 | 19 | 48 |
| 2003 | -6 | 191 |
| 2002 | 1.5 | 104 |
| 2001 | -29.8 | 189 |
| 2000 | -45.5 | 186 |
| 1999 | -18.7 | 185 |
| 1998 | -2.4 | 183 |
| 1997 | 46.8 | 22 |
| 1996 | 61.9 | 13 |
| 1995 | 43.5 | 17 |
| 1994 | 21.1 | 24 |
| 1993 | 20 | 17 |
| 1992 | 17.8 | 19 |
| 1991 | 14.8 | 21 |
| 1990 | 10.9 | 23 |
| 1989 | 6.8 | 28 |
| 1988 | 5.8 | 25 |
| 1987 | 3.9 | 26 |
| 1986 | 2.6 | 27 |