| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 74.2 | 54 |
| 2015 | 73.83 | 58 |
| 2014 | 73.35 | 64 |
| 2013 | 73.21 | 63 |
| 2012 | 73.7 | 61 |
| 2011 | 74.14 | 54 |
| 2010 | 73.54 | 54 |
| 2009 | 73.5 | 54 |
| 2008 | 73.45 | 62 |
| 2007 | 72.76 | 69 |
| 2006 | 72.96 | 61 |
| 2005 | 73.87 | 55 |
| 2004 | 73.54 | 55 |
| 2003 | 74.34 | 52 |
| 2002 | 72.89 | 61 |
| 2001 | 74.41 | 56 |
| 2000 | 73.02 | 62 |
| 1999 | 75.42 | 52 |
| 1998 | 76.36 | 45 |
| 1997 | 77.26 | 43 |
| 1996 | 77.99 | 38 |
| 1995 | 77.28 | 46 |
| 1994 | 76.62 | 51 |
| 1993 | 76.12 | 58 |
| 1992 | 76.83 | 56 |
| 1991 | 76.5 | 56 |