| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 19.22 | 125 |
| 2015 | 19.28 | 144 |
| 2014 | 14.67 | 149 |
| 2013 | 16.71 | 148 |
| 2012 | 14.77 | 151 |
| 2011 | 10.63 | 155 |
| 2010 | 12.31 | 156 |
| 2009 | 10.49 | 158 |
| 2008 | 6.48 | 164 |
| 2007 | 7 | 165 |
| 2006 | 5.92 | 165 |
| 2005 | 6.39 | 164 |
| 2004 | 8.68 | 162 |
| 2003 | 10.53 | 161 |
| 2002 | 7.53 | 162 |
| 2001 | 5.74 | 160 |
| 2000 | 6.43 | 159 |
| 1999 | 9.19 | 155 |
| 1998 | 9.53 | 153 |
| 1997 | 6.99 | 155 |
| 1996 | 13.88 | 138 |
| 1995 | 16.33 | 129 |
| 1994 | 13.87 | 131 |
| 1993 | 8.41 | 141 |
| 1992 | 12.19 | 131 |
| 1991 | 10.67 | 129 |
| 1990 | 12.4 | 123 |
| 1989 | 28 | 79 |
| 1988 | 18.71 | 106 |
| 1987 | 33.63 | 58 |
| 1986 | 39.81 | 51 |