| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 54.88 | 117 |
| 2015 | 54.37 | 119 |
| 2014 | 53.58 | 121 |
| 2013 | 52.73 | 125 |
| 2012 | 51.5 | 129 |
| 2011 | 51.77 | 127 |
| 2010 | 52.71 | 125 |
| 2009 | 54.73 | 113 |
| 2008 | 59.29 | 83 |
| 2007 | 60.84 | 69 |
| 2006 | 60.51 | 69 |
| 2005 | 59.84 | 68 |
| 2004 | 57.99 | 86 |
| 2003 | 57.51 | 89 |
| 2002 | 57.42 | 85 |
| 2001 | 57.36 | 92 |
| 2000 | 56.82 | 91 |
| 1999 | 55.1 | 103 |
| 1998 | 52.63 | 121 |
| 1997 | 49.68 | 141 |
| 1996 | 48.35 | 146 |
| 1995 | 47.41 | 152 |
| 1994 | 45.83 | 155 |
| 1993 | 44.68 | 160 |
| 1992 | 44.46 | 163 |
| 1991 | 44.88 | 164 |