| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 52.8 | 178 |
| 2015 | 52.6 | 179 |
| 2014 | 52.7 | 178 |
| 2013 | 52.9 | 178 |
| 2012 | 53.2 | 174 |
| 2011 | 53.5 | 172 |
| 2010 | 53.9 | 165 |
| 2009 | 53.8 | 165 |
| 2008 | 53.8 | 163 |
| 2007 | 53.8 | 163 |
| 2006 | 53.9 | 161 |
| 2005 | 54.1 | 160 |
| 2004 | 54 | 160 |
| 2003 | 53.9 | 160 |
| 2002 | 53.8 | 155 |
| 2001 | 53.9 | 152 |
| 2000 | 54 | 148 |
| 1999 | 53.8 | 147 |
| 1998 | 53.6 | 146 |
| 1997 | 53.5 | 145 |
| 1996 | 53.5 | 144 |
| 1995 | 53.5 | 139 |
| 1994 | 53.2 | 138 |
| 1993 | 53 | 137 |
| 1992 | 52.9 | 137 |
| 1991 | 52.8 | 138 |
| 1990 | 52.8 | 137 |
| 1989 | 52.8 | 134 |
| 1988 | 52.9 | 132 |
| 1987 | 53.1 | 131 |
| 1986 | 53.3 | 129 |