year,ssb,rec,land,fmort
1929,NA,NA,56.9,NA
1930,NA,NA,49.4,NA
1931,NA,NA,44.2,NA
1932,NA,NA,44.5,NA
1933,NA,NA,46.8,NA
1934,NA,NA,47.5,NA
1935,43841.52,7227.7,47.3,0.27
1936,47712.93,8199.4,48.9,0.37
1937,49381.24,8326.3,49.5,0.37
1938,51448.71,8452.3,49.6,0.32
1939,53923.51,8016.5,50.9,0.28
1940,56504,7480.1,53.4,0.3
1941,58583.72,7155.5,52.2,0.29
1942,61715.32,6541.1,50.4,0.26
1943,66371.45,6267.5,53.7,0.24
1944,70827.99,7042.7,53.4,0.24
1945,73717.38,4786.9,53.4,0.22
1946,76925.64,4859.5,60.3,0.25
1947,78908.29,3660.2,55.7,0.23
1948,81717.84,3566.8,55.6,0.21
1949,84234.82,3588.6,55,0.24
1950,84152.27,4157.8,57.5,0.22
1951,85340.68,6087,56,0.21
1952,87127.84,4954.1,62.7,0.28
1953,85291.24,4682.3,60.7,0.21
1954,89649.36,4733.2,71.1,0.28
1955,89275.14,5499.4,57.5,0.18
1956,92447.11,4168.9,56,0.21
1957,91171.61,4835.3,63.1,0.21
1958,88710.42,4572.8,54.8,0.21
1959,86396.19,3294.1,70.7,0.22
1960,82349.24,2895.4,71.3,0.21
1961,78342.21,4016,69.7,0.21
1962,74879.03,2810.4,75.3,0.24
1963,70199.32,2797.5,71.3,0.26
1964,64836.49,2602.9,60.4,0.23
1965,60347.74,2437.8,64,0.23
1966,56825.6,2346.7,62.7,0.31
1967,50527.01,2468,56,0.28
1968,47771.44,2477.2,49.3,0.23
1969,46776.26,2675.8,58.7,0.31
1970,42582.8,2993.7,55.3,0.33
1971,38528.59,3022,48,0.28
1972,36097.33,3409.9,44,0.26
1973,34169.11,4199.2,33.7,0.22
1974,32905.86,3875.7,21.3,0.16
1975,33846.61,3943.2,28,0.21
1976,33459.24,4483.2,28,0.19
1977,33945.49,5087.9,22.9,0.15
1978,36151.77,3816.3,22.9,0.14
1979,38458.74,3869.7,23.5,0.13
1980,42004.92,4282,22.9,0.15
1981,45051.7,5423,26.9,0.14
1982,NA,NA,29.3,0.13
1983,NA,NA,29.1,0.15
1984,NA,NA,45,0.16
1985,NA,NA,56,0.22
1986,NA,NA,70,0.24
1987,NA,NA,70,0.26
1988,NA,NA,74,0.27
1989,NA,NA,67,0.27
1990,NA,NA,NA,0.26
1991,NA,NA,NA,0.28