| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 71.21 | 38 |
| 2015 | 71.36 | 37 |
| 2014 | 71.51 | 36 |
| 2013 | 71.7 | 34 |
| 2012 | 73.01 | 32 |
| 2011 | 73.44 | 32 |
| 2010 | 72.51 | 32 |
| 2009 | 72.92 | 31 |
| 2008 | 73.56 | 30 |
| 2007 | 73.7 | 29 |
| 2006 | 72.93 | 29 |
| 2005 | 73.55 | 28 |
| 2004 | 73.49 | 29 |
| 2003 | 73.09 | 29 |
| 2002 | 73.19 | 29 |
| 2001 | 73.31 | 30 |
| 2000 | 72.93 | 31 |
| 1999 | 72.33 | 31 |
| 1998 | 73.63 | 30 |
| 1997 | 74.68 | 27 |
| 1996 | 74.46 | 28 |
| 1995 | 74.06 | 30 |
| 1994 | 73.82 | 31 |
| 1993 | 75.87 | 25 |
| 1992 | 77.83 | 21 |
| 1991 | 79.71 | 16 |
| 1990 | 81.49 | 13 |