| 时间 | 值 （亿美元） | 世界排名 |
|---|---|---|
| 2016 | 317 | 55 |
| 2015 | 321 | 65 |
| 2014 | 374 | 67 |
| 2013 | 363 | 69 |
| 2012 | 345 | 67 |
| 2011 | 337 | 68 |
| 2010 | 268 | 67 |
| 2009 | 263 | 66 |
| 2008 | 393 | 62 |
| 2007 | 316 | 60 |
| 2006 | 220 | 64 |
| 2005 | 171 | 64 |
| 2004 | 136 | 65 |
| 2003 | 94 | 67 |
| 2002 | 68 | 76 |
| 2001 | 63 | 75 |
| 2000 | 55 | 76 |
| 1999 | 64 | 69 |
| 1998 | 53 | 76 |
| 1997 | 42 | 87 |
| 1996 | 46 | 81 |
| 1995 | 65 | 68 |
| 1994 | 44 | 72 |
| 1993 | 50 | 66 |
| 1992 | 55 | 64 |
| 1991 | 43 | 65 |
| 1990 | 76 | 57 |
| 1989 | 106 | 45 |
| 1988 | 104 | 42 |
| 1987 | 120 | 38 |
| 1986 | 88 | 42 |