| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 71.13 | 114 |
| 2015 | 71.05 | 115 |
| 2014 | 70.96 | 118 |
| 2013 | 71.36 | 115 |
| 2012 | 71.71 | 110 |
| 2011 | 72.29 | 106 |
| 2010 | 72.94 | 102 |
| 2009 | 73.46 | 101 |
| 2008 | 73.73 | 101 |
| 2007 | 74.09 | 97 |
| 2006 | 74.48 | 96 |
| 2005 | 74.44 | 95 |
| 2004 | 74.46 | 91 |
| 2003 | 74.38 | 92 |
| 2002 | 74.24 | 96 |
| 2001 | 73.88 | 103 |
| 2000 | 73.51 | 109 |
| 1999 | 72.9 | 116 |
| 1998 | 72.71 | 117 |
| 1997 | 71.96 | 126 |
| 1996 | 71.18 | 133 |
| 1995 | 71.58 | 132 |
| 1994 | 70.85 | 139 |
| 1993 | 71.08 | 141 |
| 1992 | 72.44 | 130 |
| 1991 | 73.44 | 127 |
| 1990 | 74.09 | 126 |