Year,Age
1998,25
1997,25
1996,24.8
1995,24.5
1994,24.5
1993,24.5
1992,24.4
1991,24.1
1990,23.9
1989,23.8
1988,23.6
1987,23.6
1986,23.1
1985,23.3
1984,23
1983,22.8
1982,22.5
1981,22.3
1980,22
1979,22.1
1978,21.8
1977,21.6
1976,21.3
1975,21.1
1974,21.1
1973,21
1972,20.9
1971,20.9
1970,20.8
1969,20.8
1968,20.8
1967,20.6
1966,20.5
1965,20.6
1964,20.5
1963,20.5
1962,20.3
1961,20.3
1960,20.3
1959,20.2
1958,20.2
1957,20.3
1956,20.1
1955,20.2
1954,20.3
1953,20.2
1952,20.2
1951,20.4
1950,20.3
1949,20.3
1948,20.4
1947,20.5
1940,21.5
1930,21.3
1920,21.2
1910,21.6
1900,21.9
1890,22