| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 76.42 | 42 |
| 2015 | 76.14 | 43 |
| 2014 | 75.7 | 44 |
| 2013 | 75.71 | 45 |
| 2012 | 76.41 | 38 |
| 2011 | 75.58 | 43 |
| 2010 | 76.38 | 38 |
| 2009 | 75.6 | 41 |
| 2008 | 78.16 | 36 |
| 2007 | 78.55 | 32 |
| 2006 | 78.93 | 30 |
| 2005 | 78.21 | 30 |
| 2004 | 79 | 28 |
| 2003 | 79.01 | 27 |
| 2002 | 79.67 | 25 |
| 2001 | 80.4 | 24 |
| 2000 | 80.87 | 23 |
| 1999 | 81.71 | 22 |
| 1998 | 81.55 | 23 |
| 1997 | 81.5 | 23 |
| 1996 | 79.54 | 33 |
| 1995 | 78.05 | 42 |
| 1994 | 81.01 | 29 |
| 1993 | 82.83 | 23 |
| 1992 | 82.53 | 24 |
| 1991 | 82.2 | 24 |