| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 163.4 | 3 |
| 2015 | 355.4 | 2 |
| 2014 | 114.1 | 3 |
| 2013 | 80.1 | 8 |
| 2012 | 58.7 | 12 |
| 2011 | 88.1 | 7 |
| 2010 | 135.4 | 5 |
| 2009 | 153.2 | 4 |
| 2008 | 84.9 | 14 |
| 2007 | 177.5 | 6 |
| 2006 | 42.1 | 25 |
| 2005 | 17.2 | 33 |
| 2004 | 26.2 | 28 |
| 2003 | 23.4 | 25 |
| 2002 | 23 | 22 |
| 2001 | 34.6 | 18 |
| 2000 | 62.1 | 17 |
| 1999 | 18.7 | 33 |
| 1998 | 27.6 | 23 |
| 1997 | 38.6 | 12 |
| 1996 | 35.6 | 11 |
| 1995 | 10.6 | 27 |
| 1994 | 12.1 | 26 |
| 1993 | 9 | 25 |