Year	Percent
1950	16.68137
1955	16.59317
1960	14.06495
1965	12.86049
1970	15.29141
1975	17.1373
1980	20.60082
1985	19.41564
1990	17.98486
1995	19.29702
2000	21.28742
2005	25.64256
2010	26.42801
2015	25.71858
2020	24.34468
2025	25.03849
2030	28.29364
2035	30.56759
2040	30.00097
2045	27.66209
2050	25.38205
2055	24.75424
2060	25.63089
2065	26.12106
2070	24.94716
2075	23.125
2080	22.13457
2085	22.15228
2090	22.67729
2095	23.01575
2100	22.75378