| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.22 | 89 |
| 2015 | 2.27 | 88 |
| 2014 | 2.31 | 83 |
| 2013 | 2.3 | 87 |
| 2012 | 2.21 | 90 |
| 2011 | 2.06 | 95 |
| 2010 | 1.93 | 99 |
| 2009 | 1.81 | 107 |
| 2008 | 1.72 | 115 |
| 2007 | 1.76 | 112 |
| 2006 | 1.89 | 110 |
| 2005 | 1.94 | 107 |
| 2004 | 1.98 | 98 |
| 2003 | 2.01 | 105 |
| 2002 | 2 | 106 |
| 2001 | 1.98 | 106 |
| 2000 | 1.96 | 103 |
| 1999 | 1.94 | 102 |
| 1998 | 1.95 | 103 |
| 1997 | 1.8 | 113 |
| 1996 | 1.58 | 124 |
| 1995 | 1.62 | 122 |
| 1994 | 1.66 | 122 |
| 1993 | 1.74 | 126 |
| 1992 | 1.85 | 119 |
| 1991 | 2 | 122 |
| 1990 | 2.17 | 116 |
| 1989 | 2.34 | 118 |
| 1988 | 2.45 | 114 |
| 1987 | 2.61 | 116 |
| 1986 | 2.79 | 107 |