| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 69.97 | 82 |
| 2015 | 70.02 | 82 |
| 2014 | 70.13 | 80 |
| 2013 | 70.81 | 77 |
| 2012 | 71.39 | 72 |
| 2011 | 72.11 | 69 |
| 2010 | 72.61 | 63 |
| 2009 | 73.02 | 60 |
| 2008 | 73.35 | 64 |
| 2007 | 74.52 | 54 |
| 2006 | 74.86 | 52 |
| 2005 | 75.04 | 51 |
| 2004 | 73.89 | 54 |
| 2003 | 73.68 | 57 |
| 2002 | 73.25 | 57 |
| 2001 | 73.56 | 59 |
| 2000 | 73.48 | 60 |
| 1999 | 73.32 | 62 |
| 1998 | 73.26 | 64 |
| 1997 | 73.1 | 67 |
| 1996 | 73.63 | 64 |
| 1995 | 74.28 | 64 |
| 1994 | 74.59 | 62 |
| 1993 | 74.93 | 61 |
| 1992 | 75.48 | 62 |
| 1991 | 74.91 | 64 |