| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 71.81 | 84 |
| 2015 | 70.55 | 109 |
| 2014 | 71.25 | 119 |
| 2013 | 70.55 | 125 |
| 2012 | 70.07 | 127 |
| 2011 | 76.42 | 118 |
| 2010 | 80.09 | 102 |
| 2009 | 58.28 | 137 |
| 2008 | 56.3 | 156 |
| 2007 | 53.94 | 161 |
| 2006 | 59.52 | 146 |
| 2005 | 56.98 | 147 |
| 2004 | 58.12 | 143 |
| 2003 | 63.75 | 127 |
| 2002 | 48.13 | 155 |
| 2001 | 48.5 | 149 |
| 2000 | 46.11 | 151 |
| 1999 | 41.95 | 150 |
| 1998 | 36.52 | 161 |
| 1997 | 36.9 | 161 |
| 1996 | 40.22 | 157 |
| 1995 | 37.85 | 158 |
| 1994 | 31.13 | 160 |
| 1993 | 48.75 | 118 |
| 1992 | 32.54 | 151 |
| 1991 | 39.81 | 130 |