| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.4 | 73 |
| 2015 | 5.79 | 138 |
| 2014 | 5.21 | 154 |
| 2013 | 4.95 | 170 |
| 2012 | 4.79 | 173 |
| 2011 | 4.25 | 175 |
| 2010 | 4.15 | 174 |
| 2009 | 4.48 | 174 |
| 2008 | 4.58 | 171 |
| 2007 | 4.38 | 173 |
| 2006 | 4.21 | 171 |
| 2005 | 4.31 | 170 |
| 2004 | 4.24 | 158 |
| 2003 | 4.38 | 154 |
| 2002 | 4.46 | 151 |
| 2001 | 4.46 | 146 |
| 2000 | 3.77 | 145 |
| 1999 | 3.35 | 143 |
| 1998 | 2.82 | 144 |
| 1997 | 2.43 | 144 |
| 1996 | 2.06 | 144 |
| 1995 | 2.52 | 140 |
| 1994 | 2.72 | 135 |
| 1993 | 3.09 | 133 |
| 1992 | 2.88 | 128 |
| 1991 | 1.75 | 129 |
| 1990 | 2.44 | 127 |
| 1989 | 2.13 | 124 |
| 1988 | 2.29 | 122 |
| 1987 | 2.13 | 119 |
| 1986 | 2.31 | 117 |