| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.14 | 64 |
| 2015 | 1.17 | 65 |
| 2014 | 1.12 | 68 |
| 2013 | 1.08 | 70 |
| 2012 | 1.07 | 74 |
| 2011 | 1.09 | 72 |
| 2010 | 1.08 | 76 |
| 2009 | 1.65 | 53 |
| 2008 | 1.04 | 83 |
| 2007 | 1.05 | 77 |
| 2006 | 1.03 | 82 |
| 2005 | 1.03 | 82 |
| 2004 | 1.03 | 85 |
| 2003 | 1.08 | 82 |
| 2002 | 1.29 | 73 |
| 2001 | 1.63 | 54 |
| 2000 | 1.92 | 43 |
| 1999 | 1.82 | 48 |
| 1998 | 1.56 | 63 |
| 1997 | 1.77 | 54 |
| 1996 | 1.77 | 56 |
| 1995 | 1.59 | 65 |
| 1994 | 1.5 | 70 |
| 1993 | 1.58 | 68 |
| 1992 | 2.38 | 39 |
| 1991 | 4.93 | 5 |
| 1990 | 2.02 | 54 |
| 1989 | 0.62 | 115 |
| 1988 | 0.59 | 114 |
| 1987 | 0.54 | 118 |
| 1986 | 0.48 | 118 |