| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 79.34 | 69 |
| 2015 | 80.39 | 87 |
| 2014 | 79.96 | 101 |
| 2013 | 78.03 | 111 |
| 2012 | 75.93 | 116 |
| 2011 | 72.86 | 123 |
| 2010 | 67.3 | 132 |
| 2009 | 61.08 | 134 |
| 2008 | 71.96 | 129 |
| 2007 | 69.65 | 130 |
| 2006 | 68.07 | 129 |
| 2005 | 62.57 | 140 |
| 2004 | 62.76 | 136 |
| 2003 | 60.44 | 135 |
| 2002 | 62.16 | 125 |
| 2001 | 65.06 | 112 |
| 2000 | 67.42 | 112 |
| 1999 | 63.29 | 106 |
| 1998 | 63.81 | 105 |
| 1997 | 62.29 | 108 |
| 1996 | 60.21 | 108 |
| 1995 | 59.91 | 111 |
| 1994 | 57.17 | 106 |
| 1993 | 54.17 | 105 |
| 1992 | 56.3 | 100 |
| 1991 | 60.36 | 84 |
| 1990 | 65.05 | 77 |
| 1989 | 64.86 | 68 |
| 1988 | 63.19 | 65 |
| 1987 | 59.57 | 67 |
| 1986 | 54.01 | 73 |