Year	Percent
1950	26.44426
1955	26.30257
1960	25.34988
1965	23.68115
1970	23.17152
1975	23.49739
1980	24.31971
1985	25.48895
1990	26.37629
1995	27.77387
2000	28.70692
2005	29.93513
2010	30.95567
2015	31.16901
2020	31.37596
2025	31.45788
2030	31.7015
2035	31.90032
2040	31.65556
2045	31.19623
2050	30.60019
2055	30.22168
2060	29.81431
2065	29.32407
2070	28.75411
2075	28.14729
2080	27.55037
2085	26.97704
2090	26.39833
2095	25.79326
2100	25.17449