| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 31.98 | 152 |
| 2015 | 32.14 | 165 |
| 2014 | 38.85 | 161 |
| 2013 | 43.57 | 147 |
| 2012 | 44.85 | 149 |
| 2011 | 51.67 | 126 |
| 2010 | 51.83 | 118 |
| 2009 | 58.65 | 86 |
| 2008 | 66.24 | 97 |
| 2007 | 64.4 | 93 |
| 2006 | 57.68 | 113 |
| 2005 | 58.82 | 103 |
| 2004 | 63.77 | 83 |
| 2003 | 57.77 | 87 |
| 2002 | 50.97 | 107 |
| 2001 | 48.43 | 115 |
| 2000 | 40.07 | 138 |
| 1999 | 37.15 | 137 |
| 1998 | 45.5 | 111 |
| 1997 | 55.68 | 85 |
| 1996 | 63.95 | 69 |
| 1995 | 46.29 | 111 |
| 1994 | 39.96 | 119 |