| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 42.11 | 131 |
| 2015 | 42.73 | 160 |
| 2014 | 50.17 | 156 |
| 2013 | 57.49 | 148 |
| 2012 | 59.82 | 146 |
| 2011 | 63.5 | 141 |
| 2010 | 60.17 | 142 |
| 2009 | 68.96 | 118 |
| 2008 | 79.7 | 116 |
| 2007 | 76.2 | 119 |
| 2006 | 67.45 | 132 |
| 2005 | 66.52 | 133 |
| 2004 | 72.86 | 115 |
| 2003 | 67.85 | 118 |
| 2002 | 60.16 | 130 |
| 2001 | 55.72 | 138 |
| 2000 | 46.11 | 150 |
| 1999 | 36.55 | 157 |
| 1998 | 45.29 | 144 |
| 1997 | 57.04 | 120 |
| 1996 | 61.86 | 104 |
| 1995 | 73.5 | 84 |
| 1994 | 37.33 | 154 |
| 1993 | 64.25 | 84 |
| 1992 | 70.22 | 72 |
| 1991 | 74.42 | 60 |
| 1990 | 76.63 | 59 |