| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 76.45 | 78 |
| 2015 | 71.76 | 108 |
| 2014 | 75.61 | 108 |
| 2013 | 76.56 | 115 |
| 2012 | 75.97 | 115 |
| 2011 | 71.11 | 129 |
| 2010 | 66.15 | 134 |
| 2009 | 58.48 | 135 |
| 2008 | 55.7 | 160 |
| 2007 | 58.34 | 146 |
| 2006 | 62.61 | 138 |
| 2005 | 72.04 | 114 |
| 2004 | 75.04 | 110 |
| 2003 | 82.19 | 86 |
| 2002 | 75.94 | 97 |
| 2001 | 71.62 | 99 |
| 2000 | 73.92 | 98 |
| 1999 | 70.56 | 93 |
| 1998 | 71.84 | 96 |
| 1997 | 78.55 | 85 |
| 1996 | 79.23 | 78 |
| 1995 | 86.11 | 60 |
| 1994 | 112.43 | 27 |
| 1993 | 107.97 | 32 |
| 1992 | 101.08 | 41 |
| 1991 | 100.87 | 35 |
| 1990 | 81.34 | 50 |