| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 29.1 | 158 |
| 2015 | 31.56 | 166 |
| 2014 | 29.13 | 178 |
| 2013 | 33.35 | 171 |
| 2012 | 35.78 | 170 |
| 2011 | 37.18 | 173 |
| 2010 | 30.1 | 178 |
| 2009 | 26.99 | 184 |
| 2008 | 28.55 | 187 |
| 2007 | 27.87 | 186 |
| 2006 | 38.41 | 168 |
| 2005 | 29.29 | 179 |
| 2004 | 24.38 | 185 |
| 2003 | 24.76 | 180 |
| 2002 | 19.31 | 184 |
| 2001 | 20.29 | 181 |
| 2000 | 22.75 | 175 |
| 1999 | 21.29 | 177 |
| 1998 | 24.95 | 171 |
| 1997 | 21.28 | 174 |
| 1996 | 19.1 | 178 |
| 1995 | 33.89 | 152 |
| 1994 | 37.19 | 129 |
| 1993 | 28.13 | 135 |
| 1992 | 27.05 | 138 |
| 1991 | 29.55 | 125 |
| 1990 | 27.03 | 137 |
| 1989 | 23.79 | 136 |
| 1988 | 31.13 | 118 |
| 1987 | 26.78 | 126 |
| 1986 | 29.62 | 115 |