1951	791.2
1952	892.0
1953	711.1
1954	518.7
1955	550.4
1956	753.5
1957	1022.7
1958	654.1
1959	662.5
1960	705.1
1961	560.9
1962	820.7
1963	758.0
1964	631.6
1965	693.5
1966	633.3
1967	567.3
1968	453.1
1969	634.4
1970	623.0
1971	639.1
1972	759.9
1973	564.3
1974	632.2
1975	588.7
1976	619.4
1977	385.8
1978	597.3
1979	368.4
1980	674.3
1981	451.4
1982	455.5
1983	827.9
1984	426.9
1985	609.8
1986	569.0
1987	436.1
1988	815.4
1989	597.8
1990	693.4
1991	461.8
1992	646.5
1993	536.2
1994	429.3
1995	705.1
1996	629.6
1997	572.4
1998	664.3
1999	520.9
2000	545.9
2001	509.3