| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 45.1 | 11 |
| 2015 | 45.2 | 12 |
| 2014 | 45.3 | 13 |
| 2013 | 45.3 | 14 |
| 2012 | 45.3 | 14 |
| 2011 | 45.3 | 15 |
| 2010 | 45.3 | 15 |
| 2009 | 45.3 | 15 |
| 2008 | 45.3 | 16 |
| 2007 | 45.3 | 16 |
| 2006 | 45.3 | 16 |
| 2005 | 45.3 | 19 |
| 2004 | 45.2 | 19 |
| 2003 | 45.2 | 19 |
| 2002 | 45.1 | 20 |
| 2001 | 45.1 | 20 |
| 2000 | 45.1 | 22 |
| 1999 | 45.2 | 24 |
| 1998 | 45.4 | 25 |
| 1997 | 45.5 | 25 |
| 1996 | 45.6 | 25 |
| 1995 | 45.6 | 24 |
| 1994 | 45.8 | 24 |
| 1993 | 45.9 | 26 |
| 1992 | 46 | 24 |
| 1991 | 46.1 | 26 |
| 1990 | 46.1 | 26 |
| 1989 | 46.2 | 25 |
| 1988 | 46.3 | 24 |
| 1987 | 46.4 | 24 |
| 1986 | 46.4 | 25 |