| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 81.23 | 34 |
| 2015 | 78.94 | 43 |
| 2014 | 77.21 | 38 |
| 2013 | 76.73 | 35 |
| 2012 | 73.2 | 39 |
| 2011 | 70.31 | 43 |
| 2010 | 69.81 | 45 |
| 2009 | 69.08 | 50 |
| 2008 | 67.33 | 44 |
| 2007 | 62.11 | 52 |
| 2006 | 58.44 | 52 |
| 2005 | 55.7 | 53 |
| 2004 | 53.47 | 57 |
| 2003 | 54.36 | 56 |
| 2002 | 53.43 | 58 |
| 2001 | 62.72 | 41 |
| 2000 | 60.93 | 38 |
| 1999 | 55.7 | 43 |
| 1998 | 56.68 | 41 |
| 1997 | 60.15 | 37 |
| 1996 | 63.75 | 31 |
| 1995 | 68.71 | 24 |
| 1994 | 61.58 | 28 |
| 1993 | 59.13 | 35 |