| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 1.27 | 141 |
| 2014 | 1.03 | 154 |
| 2013 | 2.17 | 114 |
| 2012 | 10.68 | 23 |
| 2011 | 18.87 | 11 |
| 2010 | 2.14 | 122 |
| 2009 | 3.06 | 94 |
| 2008 | 8.46 | 49 |
| 2007 | 9.33 | 51 |
| 2006 | 4.26 | 95 |
| 2005 | 3.57 | 88 |
| 2004 | 0 | 178 |
| 2003 | 2.29 | 98 |
| 2002 | 0 | 178 |
| 2001 | 0.06 | 161 |
| 2000 | 0.33 | 155 |
| 1999 | 1.83 | 100 |
| 1998 | 0.5 | 145 |
| 1997 | 0.46 | 146 |
| 1996 | 0.61 | 128 |
| 1995 | 0.02 | 154 |
| 1994 | 0.01 | 143 |
| 1993 | 0.08 | 129 |
| 1992 | 0.6 | 83 |
| 1991 | 1.29 | 51 |
| 1990 | 0.67 | 81 |
| 1989 | 0.51 | 77 |
| 1988 | 0.66 | 61 |
| 1987 | 0.63 | 70 |
| 1986 | 0.44 | 72 |