| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 77.31 | 34 |
| 2015 | 76.52 | 41 |
| 2014 | 75.24 | 49 |
| 2013 | 76.9 | 38 |
| 2012 | 76.65 | 37 |
| 2011 | 76.34 | 38 |
| 2010 | 68.03 | 94 |
| 2009 | 71.95 | 72 |
| 2008 | 73.97 | 57 |
| 2007 | 74.59 | 52 |
| 2006 | 69.46 | 89 |
| 2005 | 71.08 | 75 |
| 2004 | 71.73 | 67 |
| 2003 | 70.72 | 74 |
| 2002 | 69.75 | 81 |
| 2001 | 71.07 | 75 |
| 2000 | 69.9 | 84 |
| 1999 | 68.46 | 96 |
| 1998 | 71.16 | 79 |
| 1997 | 71.55 | 80 |
| 1996 | 72.32 | 75 |
| 1995 | 72.98 | 73 |
| 1994 | 73.86 | 69 |
| 1993 | 73.32 | 73 |
| 1992 | 72.58 | 75 |
| 1991 | 70.32 | 95 |