| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 99.43 | 46 |
| 2015 | 105.16 | 50 |
| 2014 | 105.71 | 53 |
| 2013 | 106.89 | 56 |
| 2012 | 116.68 | 48 |
| 2011 | 114.38 | 51 |
| 2010 | 144.67 | 16 |
| 2009 | 122.21 | 24 |
| 2008 | 128.69 | 37 |
| 2007 | 134.08 | 30 |
| 2006 | 118.53 | 45 |
| 2005 | 131.02 | 28 |
| 2004 | 246 | 6 |
| 2003 | 307.02 | 3 |
| 2002 | 251.13 | 5 |
| 2001 | 351.11 | 2 |
| 2000 | 334.13 | 2 |
| 1999 | 412.12 | 1 |
| 1998 | 531.74 | 1 |
| 1997 | 399.99 | 1 |
| 1996 | 504.88 | 1 |
| 1995 | 354.97 | 1 |
| 1994 | 191.87 | 4 |
| 1993 | 189.59 | 4 |
| 1992 | 184.47 | 4 |
| 1991 | 243.28 | 2 |
| 1990 | 203.34 | 4 |
| 1989 | 228.4 | 2 |
| 1988 | 265.98 | 2 |
| 1987 | 246.71 | 2 |
| 1986 | 201.24 | 3 |