| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 71.02 | 75 |
| 2015 | 71.47 | 74 |
| 2014 | 71.58 | 72 |
| 2013 | 71.9 | 70 |
| 2012 | 71.07 | 75 |
| 2011 | 71.82 | 71 |
| 2010 | 71.5 | 74 |
| 2009 | 72.25 | 69 |
| 2008 | 73.19 | 66 |
| 2007 | 73.73 | 60 |
| 2006 | 72.53 | 67 |
| 2005 | 71.78 | 71 |
| 2004 | 71.29 | 74 |
| 2003 | 69.74 | 82 |
| 2002 | 69.48 | 83 |
| 2001 | 69.26 | 92 |
| 2000 | 68.5 | 97 |
| 1999 | 67.83 | 99 |
| 1998 | 67.58 | 102 |
| 1997 | 66.71 | 113 |
| 1996 | 65.52 | 119 |
| 1995 | 64.35 | 134 |
| 1994 | 62.8 | 145 |
| 1993 | 60.73 | 156 |
| 1992 | 58.74 | 166 |
| 1991 | 56.14 | 174 |