| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 71.48 | 16 |
| 2015 | 71.68 | 16 |
| 2014 | 71.99 | 15 |
| 2013 | 71.14 | 18 |
| 2012 | 75.46 | 9 |
| 2011 | 78.36 | 6 |
| 2010 | 80.51 | 5 |
| 2009 | 82.43 | 2 |
| 2008 | 83.86 | 2 |
| 2007 | 85.55 | 1 |
| 2006 | 85.53 | 1 |
| 2005 | 85.19 | 1 |
| 2004 | 85.13 | 1 |
| 2003 | 84.58 | 2 |
| 2002 | 83.49 | 2 |
| 2001 | 81.32 | 3 |
| 2000 | 83.32 | 2 |
| 1999 | 83.41 | 3 |
| 1998 | 83.28 | 2 |
| 1997 | 83.28 | 3 |
| 1996 | 83.58 | 3 |
| 1995 | 83.38 | 3 |
| 1994 | 83.13 | 3 |
| 1993 | 83.01 | 3 |
| 1992 | 82.81 | 3 |
| 1991 | 83.48 | 3 |