Year	Percent
1950	30.9154
1955	28.3092
1960	25.57974
1965	24.18465
1970	23.28821
1975	24.52109
1980	27.23992
1985	31.6705
1990	34.67419
1995	34.94698
2000	33.49392
2005	30.10979
2010	26.28117
2015	24.27713
2020	24.17732
2025	25.64772
2030	26.69728
2035	27.01082
2040	26.23056
2045	25.03901
2050	24.35088
2055	23.80533
2060	23.51903
2065	23.14672
2070	22.56804
2075	21.88642
2080	21.28842
2085	20.87373
2090	20.61807
2095	20.44204
2100	20.2701