| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2005 | 0.01 | 167 |
| 2004 | 0.01 | 160 |
| 2003 | 0.035 | 156 |
| 2002 | 0.1 | 150 |
| 2001 | 0.1 | 147 |
| 2000 | 0.1 | 146 |
| 1999 | 0.1 | 150 |
| 1998 | 0.429 | 147 |
| 1997 | 0.46 | 144 |
| 1996 | 0.293 | 141 |
| 1995 | 0.438 | 137 |
| 1994 | 0.333 | 129 |
| 1993 | 2.271 | 122 |
| 1992 | 5.417 | 96 |
| 1991 | 5.208 | 97 |
| 1990 | 6.292 | 87 |
| 1989 | 4.542 | 101 |
| 1988 | 3.625 | 103 |
| 1987 | 6.208 | 72 |
| 1986 | 6.5 | 75 |