| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 68.29 | 55 |
| 2015 | 67.96 | 55 |
| 2014 | 67.57 | 56 |
| 2013 | 67.13 | 58 |
| 2012 | 66.65 | 63 |
| 2011 | 66.16 | 67 |
| 2010 | 65.68 | 68 |
| 2009 | 65.25 | 75 |
| 2008 | 64.85 | 78 |
| 2007 | 64.48 | 82 |
| 2006 | 64.17 | 83 |
| 2005 | 62.38 | 94 |
| 2004 | 60.63 | 106 |
| 2003 | 58.93 | 126 |
| 2002 | 57.3 | 133 |
| 2001 | 55.75 | 141 |
| 2000 | 54.29 | 149 |
| 1999 | 53.54 | 154 |
| 1998 | 52.84 | 154 |
| 1997 | 52.18 | 157 |
| 1996 | 51.52 | 160 |
| 1995 | 50.85 | 163 |
| 1994 | 50.55 | 166 |
| 1993 | 50.24 | 166 |
| 1992 | 49.94 | 169 |
| 1991 | 49.68 | 169 |
| 1990 | 49.47 | 171 |