| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 71.02 | 40 |
| 2015 | 71.05 | 41 |
| 2014 | 71.04 | 40 |
| 2013 | 71.08 | 38 |
| 2012 | 71.09 | 38 |
| 2011 | 71.1 | 40 |
| 2010 | 71.04 | 40 |
| 2009 | 70.86 | 42 |
| 2008 | 71.48 | 40 |
| 2007 | 72.14 | 35 |
| 2006 | 72.85 | 32 |
| 2005 | 73.6 | 27 |
| 2004 | 74.31 | 27 |
| 2003 | 74.99 | 28 |
| 2002 | 75.66 | 26 |
| 2001 | 76.34 | 25 |
| 2000 | 77.02 | 22 |
| 1999 | 77.71 | 20 |
| 1998 | 78.41 | 16 |
| 1997 | 79.12 | 16 |
| 1996 | 79.82 | 15 |
| 1995 | 80.49 | 15 |
| 1994 | 81.11 | 13 |
| 1993 | 81.72 | 11 |
| 1992 | 82.31 | 11 |
| 1991 | 82.89 | 10 |
| 1990 | 83.45 | 8 |