| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2011 | 99.62 | 78 |
| 2010 | 107.7 | 52 |
| 2009 | 102.06 | 54 |
| 2008 | 101.49 | 71 |
| 2007 | 102.22 | 63 |
| 2006 | 101.86 | 58 |
| 2005 | 90.86 | 79 |
| 2004 | 96.13 | 64 |
| 2003 | 90.61 | 65 |
| 2002 | 78.86 | 90 |
| 2001 | 43.17 | 156 |
| 2000 | 45.28 | 154 |
| 1999 | 34.8 | 162 |
| 1998 | 40.25 | 157 |
| 1997 | 48.63 | 140 |
| 1996 | 52.55 | 124 |
| 1995 | 51.59 | 130 |
| 1994 | 53.15 | 114 |
| 1993 | 59.79 | 91 |
| 1992 | 56.06 | 102 |
| 1991 | 64.6 | 78 |
| 1990 | 70.8 | 69 |