| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 43.2 | 19 |
| 2015 | 43.4 | 19 |
| 2014 | 43.7 | 18 |
| 2013 | 43.8 | 18 |
| 2012 | 43.9 | 18 |
| 2011 | 44 | 18 |
| 2010 | 44.1 | 17 |
| 2009 | 44.1 | 19 |
| 2008 | 44.1 | 21 |
| 2007 | 44.1 | 23 |
| 2006 | 44.1 | 25 |
| 2005 | 44.1 | 25 |
| 2004 | 44.2 | 24 |
| 2003 | 44.4 | 24 |
| 2002 | 44.7 | 23 |
| 2001 | 45 | 23 |
| 2000 | 45 | 23 |
| 1999 | 45.2 | 23 |
| 1998 | 45.3 | 26 |
| 1997 | 45.3 | 27 |
| 1996 | 45.4 | 26 |
| 1995 | 45.8 | 22 |
| 1994 | 46.1 | 21 |
| 1993 | 46.6 | 18 |
| 1992 | 47.2 | 14 |
| 1991 | 47.7 | 12 |
| 1990 | 47.8 | 10 |
| 1989 | 48 | 7 |
| 1988 | 47.9 | 8 |
| 1987 | 47.6 | 10 |
| 1986 | 47.4 | 12 |