| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 100.68 | 43 |
| 2015 | 95.95 | 66 |
| 2014 | 93.74 | 79 |
| 2013 | 90.69 | 83 |
| 2012 | 89.33 | 91 |
| 2011 | 87.08 | 95 |
| 2010 | 82.11 | 97 |
| 2009 | 75.23 | 101 |
| 2008 | 80.75 | 113 |
| 2007 | 80.66 | 111 |
| 2006 | 77.79 | 113 |
| 2005 | 70.27 | 124 |
| 2004 | 71.21 | 119 |
| 2003 | 69.44 | 113 |
| 2002 | 60.92 | 127 |
| 2001 | 58.08 | 130 |
| 2000 | 60.79 | 121 |
| 1999 | 54.02 | 123 |
| 1998 | 56.66 | 116 |
| 1997 | 50.47 | 135 |
| 1996 | 45.48 | 144 |
| 1995 | 43.68 | 148 |
| 1994 | 40.74 | 147 |
| 1993 | 40.52 | 135 |
| 1992 | 41.39 | 131 |
| 1991 | 44.18 | 122 |
| 1990 | 45.28 | 119 |