| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 10.93 | 50 |
| 2015 | 3.9 | 114 |
| 2014 | 5.25 | 120 |
| 2013 | 17.56 | 35 |
| 2012 | 12.79 | 61 |
| 2011 | 14.66 | 56 |
| 2010 | 22.69 | 31 |
| 2009 | -5.51 | 157 |
| 2008 | 30.18 | 22 |
| 2007 | 51.75 | 8 |
| 2006 | 34.52 | 28 |
| 2005 | 54.39 | 4 |
| 2004 | 31.86 | 22 |
| 2003 | 46.38 | 10 |
| 2002 | 44.14 | 9 |
| 2001 | 42.95 | 24 |
| 2000 | 44.54 | 19 |
| 1999 | 40.58 | 12 |
| 1998 | 24.04 | 22 |
| 1997 | 33.92 | 25 |
| 1996 | 35.13 | 26 |
| 1995 | 115.5 | 4 |
| 1994 | 567.91 | 6 |
| 1993 | 1809.15 | 3 |