| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 80.96 | 39 |
| 2015 | 81.48 | 42 |
| 2014 | 81.29 | 52 |
| 2013 | 76.99 | 65 |
| 2012 | 87.14 | 51 |
| 2011 | 92.58 | 44 |
| 2010 | 82.63 | 50 |
| 2009 | 72.74 | 56 |
| 2008 | 84.72 | 59 |
| 2007 | 77.01 | 63 |
| 2006 | 77.41 | 66 |
| 2005 | 81.68 | 53 |
| 2004 | 95.04 | 35 |
| 2003 | 91.93 | 34 |
| 2002 | 82.41 | 44 |
| 2001 | 84.3 | 43 |
| 2000 | 91.26 | 35 |
| 1999 | 74.18 | 53 |
| 1998 | 65.21 | 63 |
| 1997 | 62.53 | 70 |
| 1996 | 71.83 | 53 |
| 1995 | 59.34 | 76 |
| 1994 | 40.06 | 118 |