Year	Percent
1950	28.51472
1955	28.01781
1960	27.43271
1965	26.01139
1970	24.78165
1975	24.95162
1980	25.58065
1985	26.52175
1990	27.46052
1995	27.69287
2000	27.91911
2005	28.04311
2010	28.30664
2015	28.96336
2020	29.87016
2025	30.59425
2030	31.02099
2035	31.04392
2040	30.93031
2045	30.92661
2050	30.9422
2055	30.89521
2060	30.63869
2065	30.26418
2070	29.87362
2075	29.52326
2080	29.16957
2085	28.77789
2090	28.34237
2095	27.85916
2100	27.36998