| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.01 | 101 |
| 2015 | 0.95 | 115 |
| 2014 | 0.91 | 121 |
| 2013 | 0.99 | 115 |
| 2012 | 1.03 | 112 |
| 2011 | 1.09 | 104 |
| 2010 | 1.21 | 99 |
| 2009 | 1.32 | 98 |
| 2008 | 1.24 | 105 |
| 2007 | 1.43 | 88 |
| 2006 | 1.58 | 79 |
| 2005 | 1.79 | 68 |
| 2004 | 1.72 | 74 |
| 2003 | 1.9 | 72 |
| 2002 | 1.83 | 70 |
| 2001 | 1.76 | 73 |
| 2000 | 1.88 | 63 |
| 1999 | 1.86 | 66 |
| 1998 | 1.76 | 69 |
| 1997 | 1.6 | 82 |
| 1996 | 1.68 | 76 |
| 1995 | 1.79 | 75 |
| 1994 | 1.98 | 70 |
| 1993 | 2.02 | 75 |