| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 67.57 | 51 |
| 2015 | 56.6 | 71 |
| 2014 | 61.11 | 63 |
| 2013 | 46.17 | 86 |
| 2012 | 41.37 | 95 |
| 2011 | 38.15 | 101 |
| 2010 | 38.72 | 101 |
| 2009 | 41.07 | 96 |
| 2008 | 37.5 | 97 |
| 2007 | 37.1 | 104 |
| 2006 | 35.89 | 102 |
| 2005 | 39.7 | 92 |
| 2004 | 40.74 | 83 |
| 2003 | 39.86 | 83 |
| 2002 | 42.01 | 79 |
| 2001 | 48.01 | 64 |
| 2000 | 46.64 | 56 |
| 1999 | 49.77 | 54 |
| 1998 | 48.36 | 54 |
| 1997 | 50.97 | 46 |
| 1996 | 46.42 | 53 |
| 1995 | 48.55 | 50 |