| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 78.15 | 73 |
| 2015 | 72.23 | 105 |
| 2014 | 65.65 | 126 |
| 2013 | 64.44 | 135 |
| 2012 | 66.41 | 133 |
| 2011 | 63.78 | 140 |
| 2010 | 60.95 | 140 |
| 2009 | 56.03 | 144 |
| 2008 | 58.07 | 150 |
| 2007 | 57.06 | 150 |
| 2006 | 56.46 | 150 |
| 2005 | 54.58 | 151 |
| 2004 | 54.23 | 149 |
| 2003 | 51.24 | 151 |
| 2002 | 48.37 | 152 |
| 2001 | 48.53 | 148 |
| 2000 | 53.13 | 139 |
| 1999 | 51.27 | 128 |
| 1998 | 51.78 | 127 |
| 1997 | 49.32 | 138 |
| 1996 | 50.72 | 130 |
| 1995 | 46.11 | 139 |
| 1994 | 29.3 | 161 |
| 1993 | 25.97 | 157 |
| 1992 | 35.51 | 143 |
| 1991 | 35.64 | 139 |
| 1990 | 38.31 | 132 |
| 1989 | 38.06 | 121 |
| 1988 | 38.47 | 111 |
| 1987 | 32.88 | 119 |
| 1986 | 30.77 | 120 |