| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 71.28 | 73 |
| 2015 | 71.48 | 73 |
| 2014 | 71.64 | 71 |
| 2013 | 71.72 | 71 |
| 2012 | 72.37 | 67 |
| 2011 | 72.74 | 65 |
| 2010 | 72.11 | 68 |
| 2009 | 72.39 | 67 |
| 2008 | 73.26 | 65 |
| 2007 | 73.53 | 62 |
| 2006 | 72.8 | 64 |
| 2005 | 72.13 | 67 |
| 2004 | 72.82 | 59 |
| 2003 | 73.68 | 56 |
| 2002 | 74.5 | 53 |
| 2001 | 75.92 | 49 |
| 2000 | 75.91 | 46 |
| 1999 | 75.77 | 48 |
| 1998 | 75.83 | 52 |
| 1997 | 74.95 | 57 |
| 1996 | 76.17 | 52 |
| 1995 | 77.11 | 48 |
| 1994 | 76.9 | 49 |
| 1993 | 77.93 | 45 |
| 1992 | 78.46 | 41 |
| 1991 | 79.78 | 36 |