| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 57.57 | 68 |
| 2015 | 57.29 | 68 |
| 2014 | 56.96 | 69 |
| 2013 | 56.54 | 70 |
| 2012 | 56.09 | 71 |
| 2011 | 55.63 | 75 |
| 2010 | 55.17 | 77 |
| 2009 | 54.61 | 80 |
| 2008 | 54.06 | 83 |
| 2007 | 53.54 | 86 |
| 2006 | 53.06 | 88 |
| 2005 | 50.36 | 102 |
| 2004 | 47.67 | 115 |
| 2003 | 45.01 | 125 |
| 2002 | 42.4 | 132 |
| 2001 | 39.88 | 141 |
| 2000 | 37.46 | 149 |
| 1999 | 35.49 | 155 |
| 1998 | 33.61 | 159 |
| 1997 | 31.78 | 164 |
| 1996 | 29.97 | 165 |
| 1995 | 28.18 | 168 |
| 1994 | 26.48 | 170 |
| 1993 | 24.81 | 171 |
| 1992 | 23.19 | 171 |
| 1991 | 21.66 | 172 |
| 1990 | 20.22 | 173 |