| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 88.15 | 75 |
| 2014 | 90.93 | 81 |
| 2013 | 87.97 | 87 |
| 2012 | 88.24 | 92 |
| 2011 | 87.91 | 94 |
| 2010 | 81.03 | 98 |
| 2009 | 73.8 | 105 |
| 2008 | 86.21 | 101 |
| 2007 | 83.56 | 103 |
| 2006 | 98.03 | 66 |
| 2005 | 103.24 | 55 |
| 2004 | 109.74 | 49 |
| 2003 | 113.46 | 42 |
| 2002 | 95.28 | 56 |
| 2001 | 104.32 | 46 |
| 2000 | 104.19 | 50 |
| 1999 | 121.82 | 28 |
| 1998 | 125.67 | 21 |
| 1997 | 100.63 | 43 |
| 1996 | 107.5 | 34 |
| 1995 | 91.88 | 53 |
| 1994 | 101.85 | 37 |