| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 99.62 | 45 |
| 2015 | 97.2 | 64 |
| 2014 | 90.85 | 82 |
| 2013 | 85.6 | 91 |
| 2012 | 82.68 | 103 |
| 2011 | 81.27 | 106 |
| 2010 | 75.9 | 107 |
| 2009 | 72.76 | 106 |
| 2008 | 84.99 | 104 |
| 2007 | 85.27 | 97 |
| 2006 | 86.07 | 101 |
| 2005 | 84.73 | 94 |
| 2004 | 84.92 | 91 |
| 2003 | 85.22 | 78 |
| 2002 | 83.22 | 78 |
| 2001 | 80.84 | 84 |
| 2000 | 76.06 | 90 |
| 1999 | 66.97 | 101 |
| 1998 | 65.76 | 103 |
| 1997 | 75.55 | 90 |
| 1996 | 67.99 | 97 |
| 1995 | 63.51 | 108 |