Year	Percent
1950	13.92569
1955	14.2398
1960	13.6132
1965	13.66932
1970	13.63173
1975	14.60767
1980	17.63086
1985	20.18702
1990	21.5819
1995	20.28863
2000	21.58519
2005	22.04086
2010	25.42572
2015	29.69834
2020	28.40456
2025	28.46636
2030	26.6832
2035	25.6723
2040	26.78817
2045	27.01294
2050	26.6147
2055	25.77535
2060	25.2833
2065	25.09552
2070	25.30261
2075	25.29963
2080	24.88178
2085	24.27493
2090	23.81396
2095	23.65282
2100	23.68395