1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971
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1.05 2.04 2.99 3.62 2.27 4.24 3.63 2.98 3.10 3.36 3.85 4.14 5.20 4.89 5.69 7.12 6.90 4.88
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1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989
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4.96 7.31 8.18 6.76 5.87 6.09 8.34 10.67 12.05 14.78 12.28 9.57 10.89 8.43 6.46 6.76 7.65 8.54
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1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
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7.88 5.86 3.89 3.43 5.31 5.95 5.51 5.63 5.05 5.08 6.11 3.48 2.00 1.24 1.89 3.62 4.93 4.52
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2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
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1.82 0.47 0.32 0.18 0.18 0.13 0.12 0.32 0.61 1.20 2.33
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