| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.4 | 134 |
| 2015 | 0.75 | 162 |
| 2014 | 3.92 | 81 |
| 2013 | 2.2 | 128 |
| 2012 | 2.06 | 124 |
| 2011 | 3.8 | 101 |
| 2010 | 10.63 | 10 |
| 2009 | -1.57 | 123 |
| 2008 | 0.7 | 167 |
| 2007 | 6.52 | 81 |
| 2006 | 5.62 | 93 |
| 2005 | 5.42 | 89 |
| 2004 | 6.51 | 66 |
| 2003 | 4.12 | 100 |
| 2002 | 5.57 | 43 |
| 2001 | -1.26 | 177 |
| 2000 | 6.42 | 38 |
| 1999 | 6.72 | 33 |
| 1998 | 4.21 | 86 |
| 1997 | 6.11 | 52 |
| 1996 | 6.18 | 52 |
| 1995 | 6.5 | 45 |
| 1994 | 7.49 | 27 |
| 1993 | 6.8 | 30 |
| 1992 | 8.29 | 21 |
| 1991 | 8.36 | 19 |
| 1990 | 5.65 | 44 |
| 1989 | 8.75 | 19 |
| 1988 | 8.02 | 34 |
| 1987 | 12.7 | 8 |
| 1986 | 11.52 | 7 |
| 1985 | 4.81 | |
| 1984 | 10.05 | |
| 1983 | 9.04 | |
| 1982 | 4.8 | |
| 1981 | 7.11 | |
| 1980 | 8.04 | |
| 1979 | 8.83 | |
| 1978 | 13.56 | |
| 1977 | 11.41 | |
| 1976 | 14.28 | |
| 1975 | 6.19 | |
| 1974 | 2.67 | |
| 1973 | 12.83 | |
| 1972 | 13.87 | |
| 1971 | 13.43 | |
| 1970 | 11.51 | |
| 1969 | 9.59 | |
| 1968 | 9.71 | |
| 1967 | 11.15 | |
| 1966 | 9.63 | |
| 1965 | 11.89 | |
| 1964 | 12.63 | |
| 1963 | 10.74 | |
| 1962 | 8.93 | |
| 1961 | 7.05 | |
| 1960 | 7.2 | |
| 1959 | 8.81 | |
| 1958 | 7.68 | |
| 1957 | 7.81 | |
| 1956 | 6.17 | |
| 1955 | 7.72 | |
| 1954 | 9.64 | |
| 1953 | 9.49 | |
| 1952 | 12 |