| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 72.26 | 105 |
| 2015 | 72.13 | 106 |
| 2014 | 71.95 | 106 |
| 2013 | 71.91 | 109 |
| 2012 | 71.79 | 109 |
| 2011 | 71.61 | 112 |
| 2010 | 71.36 | 114 |
| 2009 | 71.07 | 116 |
| 2008 | 70.73 | 122 |
| 2007 | 70.37 | 124 |
| 2006 | 70.03 | 125 |
| 2005 | 69.77 | 127 |
| 2004 | 70.35 | 126 |
| 2003 | 71 | 125 |
| 2002 | 71.69 | 119 |
| 2001 | 72.41 | 116 |
| 2000 | 73.14 | 115 |
| 1999 | 73.89 | 107 |
| 1998 | 74.65 | 101 |
| 1997 | 75.42 | 97 |
| 1996 | 76.18 | 91 |
| 1995 | 76.94 | 89 |
| 1994 | 77.62 | 85 |
| 1993 | 78.31 | 83 |
| 1992 | 79 | 80 |
| 1991 | 79.69 | 74 |
| 1990 | 80.38 | 69 |