| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 70.17 | 80 |
| 2015 | 70.36 | 80 |
| 2014 | 70.05 | 81 |
| 2013 | 70.62 | 79 |
| 2012 | 70.89 | 76 |
| 2011 | 70.7 | 78 |
| 2010 | 69.4 | 83 |
| 2009 | 67.05 | 99 |
| 2008 | 69.32 | 91 |
| 2007 | 69.15 | 93 |
| 2006 | 68.73 | 96 |
| 2005 | 68.01 | 97 |
| 2004 | 67.19 | 103 |
| 2003 | 67.36 | 99 |
| 2002 | 67.12 | 101 |
| 2001 | 67.51 | 102 |
| 2000 | 68.14 | 99 |
| 1999 | 68.61 | 93 |
| 1998 | 71.6 | 74 |
| 1997 | 71.82 | 77 |
| 1996 | 71.93 | 78 |
| 1995 | 73.44 | 71 |
| 1994 | 73.57 | 71 |
| 1993 | 74.65 | 65 |
| 1992 | 74.02 | 68 |
| 1991 | 72.85 | 78 |