1960 -nan -nan -nan meters
 1960 -nan -nan -nan meters
 1961 1973.311 -nan -nan meters
 1962 2061.112 -nan -nan meters
 1963 2216.261 -nan -nan meters
 1964 2125.285 -nan -nan meters
 1965 2231.894 -nan -nan meters
 1966 2264.359 -nan -nan meters
 1967 2115.825 -nan 2249.950 meters
 1968 2054.751 -nan 2114.560 meters
 1969 2081.592 -nan 2210.650 meters
 1970 2197.674 -nan -nan meters
 1971 2328.174 -nan 2350.140 meters
 1972 2308.346 -nan -nan meters
 1973 2290.364 -nan -nan meters
 1974 2325.424 -nan 2275.500 meters
 1975 2152.033 -nan -nan meters
 1976 1966.260 -nan -nan meters
 1977 2020.397 -nan -nan meters
 1978 2079.739 -nan 2159.660 meters
 1979 2010.422 -nan -nan meters
 1980 2249.119 -nan 2414.667 meters
 1981 2038.992 -nan 2184.433 meters
 1982 2070.644 -nan 2209.533 meters
 1983 2070.511 -nan 2271.800 meters
 1984 2230.472 -nan 2227.067 meters
 1985 2036.793 -nan 2159.233 meters
 1986 2129.334 -nan 2182.775 meters
 1987 1942.506 -nan 2275.500 meters
 1988 2018.802 -nan 2215.300 meters
 1989 1895.420 -nan -nan meters
 1990 2126.010 -nan 2196.400 meters
 1991 2171.557 -nan 2208.600 meters
 1992 2183.470 -nan 2327.775 meters
 1993 1760.613 -nan -nan meters
 1994 1847.627 -nan 2124.220 meters
 1995 2004.627 -nan 2267.050 meters
 1996 2137.696 -nan 2268.100 meters
 1997 2047.599 -nan -nan meters
 1998 1923.904 -nan -nan meters
 1999 1930.199 -nan 2215.960 meters
 2000 1941.992 -nan -nan meters
 2001 1935.379 -nan -nan meters
 2002 2045.135 -nan 2461.500 meters
 2003 1928.303 -nan 2246.600 meters
 2004 1915.619 -nan -nan meters