| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 79.23 | 70 |
| 2015 | 76.15 | 95 |
| 2014 | 80.26 | 99 |
| 2013 | 78.34 | 109 |
| 2012 | 78.7 | 110 |
| 2011 | 76.94 | 116 |
| 2010 | 82.34 | 95 |
| 2009 | 82.16 | 93 |
| 2008 | 76.9 | 120 |
| 2007 | 84.62 | 101 |
| 2006 | 81.48 | 106 |
| 2005 | 77.77 | 103 |
| 2004 | 72.89 | 114 |
| 2003 | 75.97 | 98 |
| 2002 | 96.6 | 54 |
| 2001 | 101.34 | 48 |
| 2000 | 81.09 | 85 |
| 1999 | 87.37 | 64 |
| 1998 | 82.51 | 78 |
| 1997 | 76.68 | 88 |
| 1996 | 81.91 | 73 |
| 1995 | 84.17 | 64 |
| 1994 | 64.84 | 93 |