| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 70.6 | 118 |
| 2015 | 70.44 | 119 |
| 2014 | 70.29 | 122 |
| 2013 | 70.16 | 123 |
| 2012 | 68.89 | 131 |
| 2011 | 69.45 | 126 |
| 2010 | 70 | 124 |
| 2009 | 69.68 | 129 |
| 2008 | 70.19 | 126 |
| 2007 | 70.71 | 122 |
| 2006 | 71.24 | 120 |
| 2005 | 71.76 | 115 |
| 2004 | 72.29 | 113 |
| 2003 | 72.84 | 110 |
| 2002 | 73.41 | 107 |
| 2001 | 73.99 | 101 |
| 2000 | 74.61 | 96 |
| 1999 | 75.29 | 92 |
| 1998 | 75.99 | 90 |
| 1997 | 76.69 | 85 |
| 1996 | 77.4 | 83 |
| 1995 | 76.94 | 88 |
| 1994 | 76.46 | 96 |
| 1993 | 75.97 | 97 |
| 1992 | 75.46 | 105 |
| 1991 | 74.91 | 112 |
| 1990 | 74.32 | 122 |