| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 61.6 | 60 |
| 2015 | 61.94 | 58 |
| 2014 | 62.33 | 56 |
| 2013 | 63.03 | 53 |
| 2012 | 62.52 | 57 |
| 2011 | 60.65 | 69 |
| 2010 | 61.19 | 60 |
| 2009 | 61.66 | 61 |
| 2008 | 62.1 | 63 |
| 2007 | 60.11 | 74 |
| 2006 | 58.14 | 90 |
| 2005 | 58.22 | 87 |
| 2004 | 56.76 | 98 |
| 2003 | 55.51 | 104 |
| 2002 | 54.96 | 106 |
| 2001 | 54.57 | 110 |
| 2000 | 54.8 | 105 |
| 1999 | 55.77 | 98 |
| 1998 | 54.81 | 105 |
| 1997 | 54.07 | 111 |
| 1996 | 53.35 | 118 |
| 1995 | 53.61 | 119 |
| 1994 | 52.68 | 125 |
| 1993 | 52.79 | 122 |
| 1992 | 51.12 | 130 |
| 1991 | 49.43 | 143 |