| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 53.9 | 175 |
| 2015 | 53.5 | 175 |
| 2014 | 53.2 | 175 |
| 2013 | 52.9 | 177 |
| 2012 | 52.7 | 178 |
| 2011 | 52.5 | 179 |
| 2010 | 52.2 | 179 |
| 2009 | 52.1 | 178 |
| 2008 | 52 | 178 |
| 2007 | 51.8 | 178 |
| 2006 | 51.7 | 179 |
| 2005 | 51.5 | 178 |
| 2004 | 51.3 | 178 |
| 2003 | 51 | 179 |
| 2002 | 50.7 | 179 |
| 2001 | 50.4 | 181 |
| 2000 | 50.3 | 182 |
| 1999 | 50.1 | 184 |
| 1998 | 50 | 185 |
| 1997 | 50 | 184 |
| 1996 | 49.9 | 183 |
| 1995 | 49.5 | 187 |
| 1994 | 49.2 | 190 |
| 1993 | 48.7 | 191 |
| 1992 | 48.1 | 193 |
| 1991 | 47.6 | 193 |
| 1990 | 47.5 | 193 |
| 1989 | 47.3 | 191 |
| 1988 | 47.4 | 191 |
| 1987 | 47.7 | 190 |
| 1986 | 47.9 | 190 |