| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 58.39 | 61 |
| 2015 | 59.85 | 65 |
| 2014 | 59.22 | 66 |
| 2013 | 56.28 | 64 |
| 2012 | 57.55 | 57 |
| 2011 | 55.45 | 63 |
| 2010 | 53.76 | 70 |
| 2009 | 50.56 | 81 |
| 2008 | 47.81 | 77 |
| 2007 | 47.57 | 82 |
| 2006 | 40.78 | 93 |
| 2005 | 35.47 | 100 |
| 2004 | 33.67 | 99 |
| 2003 | 30.2 | 107 |
| 2002 | 26.49 | 115 |
| 2001 | 29.52 | 104 |
| 2000 | 17.98 | 131 |
| 1999 | 17.5 | 128 |
| 1998 | 14.3 | 143 |
| 1997 | 13.26 | 144 |
| 1996 | 11.28 | 146 |
| 1995 | 11.77 | 147 |
| 1994 | 13.38 | 133 |
| 1993 | 73.85 | 18 |