| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 62.9 | 134 |
| 2015 | 63.69 | 135 |
| 2014 | 64.56 | 137 |
| 2013 | 65.53 | 137 |
| 2012 | 66.56 | 136 |
| 2011 | 67.55 | 136 |
| 2010 | 68.46 | 136 |
| 2009 | 69.35 | 137 |
| 2008 | 70.17 | 135 |
| 2007 | 70.94 | 134 |
| 2006 | 71.69 | 132 |
| 2005 | 72.47 | 131 |
| 2004 | 73.3 | 130 |
| 2003 | 74.16 | 130 |
| 2002 | 75.03 | 130 |
| 2001 | 75.87 | 128 |
| 2000 | 76.62 | 126 |
| 1999 | 77.55 | 125 |
| 1998 | 78.45 | 124 |
| 1997 | 79.31 | 124 |
| 1996 | 80.11 | 124 |
| 1995 | 80.81 | 125 |
| 1994 | 81.64 | 124 |
| 1993 | 82.4 | 124 |
| 1992 | 83.08 | 122 |
| 1991 | 83.66 | 123 |
| 1990 | 84.15 | 123 |
| 1989 | 84.61 | 121 |
| 1988 | 84.98 | 122 |
| 1987 | 85.26 | 122 |
| 1986 | 85.44 | 121 |