| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 70.25 | 53 |
| 2015 | 68.9 | 65 |
| 2014 | 64.2 | 82 |
| 2013 | 60.03 | 98 |
| 2012 | 58.78 | 104 |
| 2011 | 57.85 | 110 |
| 2010 | 53.42 | 114 |
| 2009 | 50.28 | 115 |
| 2008 | 63.62 | 104 |
| 2007 | 63.16 | 99 |
| 2006 | 63.1 | 96 |
| 2005 | 60.32 | 97 |
| 2004 | 59.2 | 96 |
| 2003 | 58.85 | 84 |
| 2002 | 58.13 | 88 |
| 2001 | 59.31 | 78 |
| 2000 | 56.58 | 94 |
| 1999 | 51.75 | 99 |
| 1998 | 50.3 | 99 |
| 1997 | 54.92 | 89 |
| 1996 | 52.48 | 94 |
| 1995 | 53.02 | 92 |