| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 73.96 | 56 |
| 2015 | 74.85 | 52 |
| 2014 | 74.89 | 51 |
| 2013 | 74.71 | 52 |
| 2012 | 75.31 | 48 |
| 2011 | 74.67 | 52 |
| 2010 | 74.39 | 51 |
| 2009 | 73.36 | 57 |
| 2008 | 74.78 | 51 |
| 2007 | 74.08 | 59 |
| 2006 | 72.94 | 63 |
| 2005 | 71.02 | 77 |
| 2004 | 69.43 | 86 |
| 2003 | 67.18 | 101 |
| 2002 | 67.3 | 98 |
| 2001 | 70.28 | 82 |
| 2000 | 69.01 | 90 |
| 1999 | 71.1 | 78 |
| 1998 | 74.5 | 57 |
| 1997 | 76.71 | 47 |
| 1996 | 77.05 | 47 |
| 1995 | 69.66 | 92 |
| 1994 | 68.4 | 101 |
| 1993 | 69.5 | 96 |
| 1992 | 69.87 | 94 |
| 1991 | 69.09 | 102 |