| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 19.92 | 201 |
| 2015 | 19.47 | 201 |
| 2014 | 19.03 | 199 |
| 2013 | 18.59 | 199 |
| 2012 | 18.16 | 202 |
| 2011 | 17.74 | 204 |
| 2010 | 17.32 | 204 |
| 2009 | 16.91 | 204 |
| 2008 | 16.51 | 204 |
| 2007 | 16.12 | 204 |
| 2006 | 15.9 | 204 |
| 2005 | 15.7 | 204 |
| 2004 | 15.5 | 204 |
| 2003 | 15.31 | 204 |
| 2002 | 15.12 | 204 |
| 2001 | 14.93 | 205 |
| 2000 | 14.74 | 205 |
| 1999 | 14.55 | 204 |
| 1998 | 14.37 | 205 |
| 1997 | 14.19 | 204 |
| 1996 | 14.01 | 204 |
| 1995 | 13.83 | 205 |
| 1994 | 13.63 | 205 |
| 1993 | 13.37 | 205 |
| 1992 | 13.12 | 205 |
| 1991 | 12.87 | 205 |
| 1990 | 12.62 | 205 |
| 1989 | 12.38 | 203 |
| 1988 | 12.14 | 202 |
| 1987 | 11.91 | 202 |
| 1986 | 11.68 | 202 |