| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 62.15 | 139 |
| 2015 | 59.58 | 152 |
| 2014 | 58.06 | 155 |
| 2013 | 58.81 | 151 |
| 2012 | 61.98 | 139 |
| 2011 | 64.92 | 114 |
| 2010 | 66.93 | 101 |
| 2009 | 67.64 | 96 |
| 2008 | 69.62 | 89 |
| 2007 | 69.94 | 85 |
| 2006 | 69.9 | 85 |
| 2005 | 69.76 | 85 |
| 2004 | 70.55 | 78 |
| 2003 | 69.58 | 84 |
| 2002 | 69.45 | 84 |
| 2001 | 70.03 | 86 |
| 2000 | 69.53 | 87 |
| 1999 | 65.3 | 118 |
| 1998 | 66.85 | 110 |
| 1997 | 64.97 | 125 |
| 1996 | 59.9 | 157 |
| 1995 | 64.38 | 133 |
| 1994 | 67.02 | 111 |
| 1993 | 65.32 | 126 |
| 1992 | 59.18 | 164 |
| 1991 | 65.49 | 132 |