| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2015 | 166 | 42 |
| 2014 | 243 | 34 |
| 2013 | 215 | 35 |
| 2012 | 212 | 36 |
| 2011 | 224 | 34 |
| 2010 | 160 | 39 |
| 2009 | 182 | 34 |
| 2008 | 205 | 35 |
| 2007 | 120 | 42 |
| 2006 | 69 | 51 |
| 2005 | 62 | 51 |
| 2004 | 43 | 51 |
| 2003 | 28 | 54 |
| 2002 | 28 | 51 |
| 2001 | 32 | 48 |
| 2000 | 23 | 48 |
| 1999 | 22 | 47 |
| 1998 | 24 | 47 |
| 1997 | 20 | 49 |
| 1996 | 17 | 51 |
| 1995 | 17 | 48 |
| 1994 | 14 | 48 |
| 1993 | 14 | 44 |
| 1992 | 19 | 41 |
| 1991 | 17 | 43 |
| 1990 | 13 | 42 |
| 1989 | 11 | 42 |
| 1988 | 11 | 42 |
| 1987 | 4 | 64 |
| 1986 | 6 | 52 |