| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 71.24 | 113 |
| 2015 | 71.29 | 114 |
| 2014 | 71.35 | 113 |
| 2013 | 71.55 | 111 |
| 2012 | 71.69 | 111 |
| 2011 | 71.74 | 110 |
| 2010 | 71.84 | 109 |
| 2009 | 71.99 | 111 |
| 2008 | 71.93 | 115 |
| 2007 | 72.01 | 116 |
| 2006 | 72.92 | 106 |
| 2005 | 73.76 | 101 |
| 2004 | 74.3 | 93 |
| 2003 | 74.77 | 88 |
| 2002 | 75.18 | 88 |
| 2001 | 75.58 | 93 |
| 2000 | 76.01 | 88 |
| 1999 | 76.74 | 83 |
| 1998 | 77.49 | 80 |
| 1997 | 78.25 | 79 |
| 1996 | 78.99 | 78 |
| 1995 | 79.84 | 73 |
| 1994 | 80.6 | 64 |
| 1993 | 81.35 | 52 |
| 1992 | 82.07 | 49 |
| 1991 | 82.75 | 47 |
| 1990 | 83.38 | 44 |