| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 56.04 | 116 |
| 2015 | 56.63 | 118 |
| 2014 | 57.31 | 118 |
| 2013 | 58.24 | 120 |
| 2012 | 59.35 | 123 |
| 2011 | 60.45 | 123 |
| 2010 | 61.39 | 125 |
| 2009 | 62.48 | 124 |
| 2008 | 63.48 | 124 |
| 2007 | 64.46 | 124 |
| 2006 | 65.58 | 122 |
| 2005 | 66.97 | 121 |
| 2004 | 68.42 | 122 |
| 2003 | 69.98 | 123 |
| 2002 | 71.6 | 122 |
| 2001 | 73.11 | 122 |
| 2000 | 74.41 | 122 |
| 1999 | 75.87 | 123 |
| 1998 | 77.2 | 123 |
| 1997 | 78.41 | 123 |
| 1996 | 79.48 | 121 |
| 1995 | 80.41 | 121 |
| 1994 | 81.3 | 122 |
| 1993 | 81.98 | 121 |
| 1992 | 82.45 | 120 |
| 1991 | 82.76 | 121 |
| 1990 | 82.96 | 120 |
| 1989 | 83.17 | 118 |
| 1988 | 83.24 | 116 |
| 1987 | 83.24 | 117 |
| 1986 | 83.26 | 115 |