Year	Percent
1950	29.11143
1955	29.96054
1960	29.07663
1965	25.98592
1970	22.97426
1975	22.76822
1980	24.89099
1985	27.79808
1990	30.7156
1995	31.37418
2000	31.68395
2005	31.91471
2010	32.14971
2015	32.24987
2020	31.22896
2025	29.57354
2030	28.28539
2035	27.7502
2040	27.64439
2045	27.30895
2050	26.57149
2055	25.17849
2060	24.06391
2065	23.32958
2070	22.88551
2075	22.53147
2080	22.10606
2085	21.58874
2090	21.08192
2095	20.69984
2100	20.46584