| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 76.09 | 27 |
| 2015 | 76.02 | 27 |
| 2014 | 75.93 | 27 |
| 2013 | 75.9 | 27 |
| 2012 | 75.87 | 25 |
| 2011 | 75.83 | 25 |
| 2010 | 75.8 | 25 |
| 2009 | 75.27 | 25 |
| 2008 | 74.75 | 28 |
| 2007 | 74.23 | 27 |
| 2006 | 73.71 | 27 |
| 2005 | 73.21 | 30 |
| 2004 | 72.71 | 31 |
| 2003 | 72.23 | 32 |
| 2002 | 71.75 | 36 |
| 2001 | 71.29 | 38 |
| 2000 | 70.82 | 37 |
| 1999 | 70.33 | 39 |
| 1998 | 69.85 | 41 |
| 1997 | 69.36 | 46 |
| 1996 | 68.87 | 46 |
| 1995 | 68.71 | 46 |
| 1994 | 68.48 | 46 |
| 1993 | 68.21 | 47 |
| 1992 | 67.91 | 49 |
| 1991 | 67.58 | 49 |
| 1990 | 67.23 | 50 |