| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 79.45 | 9 |
| 2015 | 79.47 | 9 |
| 2014 | 79.49 | 9 |
| 2013 | 79.26 | 9 |
| 2012 | 67.19 | 32 |
| 2011 | 67.18 | 32 |
| 2010 | 66.1 | 33 |
| 2009 | 65.39 | 36 |
| 2008 | 64.7 | 39 |
| 2007 | 64.03 | 40 |
| 2006 | 63.34 | 41 |
| 2005 | 62.65 | 42 |
| 2004 | 61.94 | 44 |
| 2003 | 61.22 | 44 |
| 2002 | 60.5 | 46 |
| 2001 | 59.8 | 47 |
| 2000 | 59.09 | 48 |
| 1999 | 58.36 | 52 |
| 1998 | 57.64 | 57 |
| 1997 | 56.92 | 61 |
| 1996 | 56.2 | 62 |
| 1995 | 55.48 | 62 |
| 1994 | 54.76 | 67 |
| 1993 | 54.03 | 71 |
| 1992 | 53.29 | 75 |
| 1991 | 52.54 | 76 |
| 1990 | 51.78 | 78 |