| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 68.98 | 49 |
| 2015 | 65.38 | 57 |
| 2014 | 63.25 | 57 |
| 2013 | 60.18 | 57 |
| 2012 | 56.92 | 60 |
| 2011 | 55.01 | 64 |
| 2010 | 53.76 | 69 |
| 2009 | 51.29 | 79 |
| 2008 | 48.77 | 75 |
| 2007 | 53.02 | 71 |
| 2006 | 49.36 | 70 |
| 2005 | 48.49 | 69 |
| 2004 | 45.69 | 74 |
| 2003 | 40.61 | 82 |
| 2002 | 38.91 | 85 |
| 2001 | 39.13 | 84 |
| 2000 | 22.14 | 114 |
| 1999 | 27.04 | 101 |
| 1998 | 25.18 | 101 |
| 1997 | 23.48 | 105 |