| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 74.91 | 79 |
| 2015 | 77.93 | 91 |
| 2014 | 73.78 | 115 |
| 2013 | 71.14 | 124 |
| 2012 | 72.44 | 124 |
| 2011 | 71.88 | 126 |
| 2010 | 74.4 | 112 |
| 2009 | 83.6 | 89 |
| 2008 | 87.07 | 96 |
| 2007 | 97.18 | 72 |
| 2006 | 90.01 | 85 |
| 2005 | 88.94 | 86 |
| 2004 | 86.26 | 89 |
| 2003 | 76.4 | 96 |
| 2002 | 76.25 | 95 |
| 2001 | 82.73 | 77 |
| 2000 | 87.64 | 67 |
| 1999 | 96.35 | 50 |
| 1998 | 88.99 | 65 |
| 1997 | 90.34 | 60 |
| 1996 | 89.27 | 60 |
| 1995 | 91.49 | 55 |
| 1994 | 86.46 | 58 |