| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 91.61 | 24 |
| 2015 | 82.55 | 40 |
| 2014 | 77.66 | 61 |
| 2013 | 70.43 | 76 |
| 2012 | 75.43 | 68 |
| 2011 | 84.08 | 56 |
| 2010 | 67.3 | 75 |
| 2009 | 70.85 | 63 |
| 2008 | 69.84 | 86 |
| 2007 | 63.71 | 96 |
| 2006 | 61.01 | 103 |
| 2005 | 59.52 | 100 |
| 2004 | 62.69 | 86 |
| 2003 | 59.67 | 80 |
| 2002 | 54.3 | 98 |
| 2001 | 58.46 | 86 |
| 2000 | 55.04 | 99 |
| 1999 | 52.04 | 98 |
| 1998 | 56.13 | 88 |
| 1997 | 56.19 | 83 |
| 1996 | 53.79 | 87 |
| 1995 | 49.45 | 102 |
| 1994 | 53.8 | 78 |