| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 19.25 | 106 |
| 2015 | 18.58 | 132 |
| 2014 | 18.25 | 138 |
| 2013 | 17.83 | 143 |
| 2012 | 16.46 | 148 |
| 2011 | 16.87 | 147 |
| 2010 | 18.87 | 140 |
| 2009 | 22.48 | 112 |
| 2008 | 22.47 | 119 |
| 2007 | 21.14 | 127 |
| 2006 | 21.49 | 126 |
| 2005 | 16.8 | 147 |
| 2004 | 15.25 | 157 |
| 2003 | 15.12 | 157 |
| 2002 | 14.92 | 155 |
| 2001 | 14.64 | 152 |
| 2000 | 15.48 | 152 |
| 1999 | 15.47 | 149 |
| 1998 | 14.59 | 149 |
| 1997 | 14.48 | 149 |
| 1996 | 14.25 | 146 |
| 1995 | 14.7 | 145 |
| 1994 | 14.4 | 128 |
| 1993 | 14.57 | 124 |
| 1992 | 15.48 | 121 |
| 1991 | 16.7 | 120 |
| 1990 | 16.02 | 116 |
| 1989 | 17.53 | 96 |
| 1988 | 16.49 | 95 |
| 1987 | 16.02 | 95 |
| 1986 | 15.11 | 92 |