是不是计算新生儿死亡率的时候，平均寿命差5岁。
birth year age at 2000 population at birth mort rate live pop. death pop. pop*age birthrate life span
2000 0 0.2 10% 0.900 0.0900 0 0.003835818 46.2932844
1999 1 0.2 8% 0.828 0.0662 0.06624
1998 2 0.2 4% 0.795 0.0318 0.0635904
1997 3 0.2 2% 0.779 0.0156 0.046738944
1996 4 0.2 1% 0.771 0.0077 0.030847703
1995 5 0.2 0% 0.771 0.0000 0
1994 6 0.2 0% 0.771 0.0000 0
1993 7 0.2 0% 0.771 0.0000 0
1992 8 0.2 0% 0.771 0.0000 0
1991 9 0.2 0% 0.771 0.0000 0
1990 10 0.2 0% 0.771 0.0000 0
1989 11 0.2 0% 0.771 0.0000 0
1988 12 0.2 0% 0.771 0.0000 0
1987 13 0.2 0% 0.771 0.0000 0
1986 14 0.2 0% 0.771 0.0000 0
1985 15 0.2 0% 0.771 0.0000 0
1984 16 0.2 0% 0.771 0.0000 0
1983 17 0.2 0% 0.771 0.0000 0
1982 18 0.2 0% 0.771 0.0000 0
1981 19 0.2 0% 0.771 0.0000 0
1980 20 0.2 0% 0.771 0.0000 0
1979 21 1 0% 0.771 0.0000 0
1978 22 1 0% 0.771 0.0000 0
1977 23 1 0% 0.771 0.0000 0
1976 24 1 0% 0.771 0.0000 0
1975 25 1 0% 0.771 0.0000 0
1974 26 1 0% 0.771 0.0000 0
1973 27 1 0% 0.771 0.0000 0
1972 28 1 0% 0.771 0.0000 0
1971 29 1 0% 0.771 0.0000 0
1970 30 1 0% 0.771 0.0000 0
1969 31 1 0% 0.771 0.0000 0
1968 32 1 0% 0.771 0.0000 0
1967 33 1 0% 0.771 0.0000 0
1966 34 1 0% 0.771 0.0000 0
1965 35 1 0% 0.771 0.0000 0
1964 36 1 0% 0.771 0.0000 0
1963 37 1 0% 0.771 0.0000 0
1962 38 1 0% 0.771 0.0000 0
1961 39 1 0% 0.771 0.0000 0
1960 40 1 0% 0.771 0.0000 0
1959 41 1 0% 0.771 0.0000 0
1958 42 1 0% 0.771 0.0000 0
1957 43 1 0% 0.771 0.0000 0
1956 44 1 0% 0.771 0.0000 0
1955 45 1 0% 0.771 0.0000 0
1954 46 1 0% 0.771 0.0000 0
1953 47 1 0% 0.771 0.0000 0
1952 48 1 0% 0.771 0.0000 0
1951 49 1 0% 0.771 0.0000 0
1950 50 1 0% 0.771 0.0000 0
1949 51 1 0.5% 0.767 0.0038 0.195670836
1948 52 1 1.0% 0.760 0.0076 0.395024888
1947 53 1 1.5% 0.748 0.0112 0.594873297
1946 54 1 2.0% 0.733 0.0147 0.791967167
1945 55 1 2.5% 0.715 0.0179 0.983084244
1944 56 1 3.0% 0.694 0.0208 1.165115697
1943 57 1 3.5% 0.669 0.0234 1.335149769
1942 58 1 4.0% 0.642 0.0257 1.490549156
1941 59 1 4.5% 0.614 0.0276 1.629019245
1940 60 1 5.0% 0.583 0.0291 1.748664726
1939 61 1 5.5% 0.551 0.0303 1.848032599
1938 62 1 6.0% 0.518 0.0311 1.926140207
1937 63 1 6.5% 0.484 0.0315 1.982487574
1936 64 1 7.0% 0.450 0.0315 2.017054024
1935 65 1 7.5% 0.416 0.0312 2.030279685
1934 66 1 8.0% 0.383 0.0307 2.023033149
1933 67 1 8.5% 0.351 0.0298 1.996567047
1932 68 1 9.0% 0.319 0.0287 1.952463775
1931 69 1 9.5% 0.289 0.0274 1.892573863
1930 70 1 10.0% 0.260 0.0260 1.818949708
1929 71 1 10.5% 0.233 0.0244 1.733777388
1928 72 1 11.0% 0.207 0.0228 1.639309196
1927 73 1 11.5% 0.183 0.0211 1.53779932
1926 74 1 12.0% 0.161 0.0193 1.43144479
1925 75 1 12.5% 0.141 0.0176 1.322333394
1924 76 1 13.0% 0.123 0.0160 1.212399885
1923 77 1 13.5% 0.106 0.0143 1.103391269
1922 78 1 14.0% 0.091 0.0128 0.996841567
1921 79 1 14.5% 0.078 0.0113 0.894055973
1920 80 1 15.0% 0.066 0.0100 0.796103965
1919 81 1 15.5% 0.056 0.0087 0.703820589
1918 82 1 16.0% 0.047 0.0075 0.61781489
1917 83 1 16.5% 0.039 0.0065 0.538484303
1916 84 1 17.0% 0.033 0.0055 0.466033688
1915 85 1 17.5% 0.027 0.0047 0.400497701
1914 86 1 18.0% 0.022 0.0040 0.341765218
1913 87 1 18.5% 0.018 0.0033 0.289604626
1912 88 1 19.0% 0.015 0.0028 0.243688933