| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 44.3 | 14 |
| 2015 | 44.7 | 14 |
| 2014 | 45 | 14 |
| 2013 | 45.3 | 13 |
| 2012 | 45.7 | 12 |
| 2011 | 46 | 12 |
| 2010 | 46.2 | 11 |
| 2009 | 46.4 | 9 |
| 2008 | 46.5 | 10 |
| 2007 | 46.6 | 10 |
| 2006 | 46.6 | 10 |
| 2005 | 46.7 | 10 |
| 2004 | 46.8 | 10 |
| 2003 | 46.9 | 10 |
| 2002 | 47 | 11 |
| 2001 | 47 | 11 |
| 2000 | 46.9 | 11 |
| 1999 | 46.8 | 12 |
| 1998 | 46.7 | 11 |
| 1997 | 46.5 | 15 |
| 1996 | 46.3 | 18 |
| 1995 | 46.1 | 20 |
| 1994 | 45.9 | 23 |
| 1993 | 45.9 | 25 |
| 1992 | 46 | 26 |
| 1991 | 45.9 | 29 |
| 1990 | 45.7 | 35 |
| 1989 | 46.3 | 24 |
| 1988 | 46.7 | 18 |
| 1987 | 47 | 17 |
| 1986 | 47.3 | 15 |