| 时间 |
值 （亿美元） |
世界排名 |
| 2016 |
1687 |
6 |
| 2015 |
1583 |
6 |
| 2014 |
1593 |
6 |
| 2013 |
1328 |
9 |
| 2012 |
1339 |
7 |
| 2011 |
1378 |
7 |
| 2010 |
1320 |
5 |
| 2009 |
1185 |
7 |
| 2008 |
1387 |
6 |
| 2007 |
1195 |
7 |
| 2006 |
1072 |
5 |
| 2005 |
996 |
5 |
| 2004 |
951 |
5 |
| 2003 |
761 |
5 |
| 2002 |
651 |
6 |
| 2001 |
639 |
6 |
| 2000 |
685 |
6 |
| 1999 |
605 |
6 |
| 1998 |
621 |
7 |
| 1997 |
685 |
5 |
| 1996 |
669 |
5 |