| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 66.66 | 140 |
| 2015 | 67.4 | 141 |
| 2014 | 68.27 | 142 |
| 2013 | 69.19 | 142 |
| 2012 | 70.09 | 144 |
| 2011 | 70.87 | 144 |
| 2010 | 71.47 | 142 |
| 2009 | 72.15 | 141 |
| 2008 | 72.66 | 140 |
| 2007 | 73.01 | 138 |
| 2006 | 73.32 | 136 |
| 2005 | 73.65 | 135 |
| 2004 | 74.01 | 131 |
| 2003 | 74.35 | 131 |
| 2002 | 74.69 | 129 |
| 2001 | 74.95 | 126 |
| 2000 | 75.08 | 124 |
| 1999 | 75.57 | 122 |
| 1998 | 76.07 | 121 |
| 1997 | 76.59 | 121 |
| 1996 | 77.11 | 118 |
| 1995 | 77.61 | 117 |
| 1994 | 78.44 | 115 |
| 1993 | 79.27 | 114 |
| 1992 | 80.07 | 116 |
| 1991 | 80.87 | 117 |
| 1990 | 81.67 | 119 |
| 1989 | 82.58 | 117 |
| 1988 | 83.43 | 118 |
| 1987 | 84.2 | 119 |
| 1986 | 84.8 | 120 |