Year	Percent
1950	16.40109
1955	16.62961
1960	17.14199
1965	15.0419
1970	15.74947
1975	14.76581
1980	16.47356
1985	18.98841
1990	23.89549
1995	25.87716
2000	27.78371
2005	28.62616
2010	28.55326
2015	27.43172
2020	24.98331
2025	22.49352
2030	20.00137
2035	19.76683
2040	20.27059
2045	21.41148
2050	23.65822
2055	24.23619
2060	24.38973
2065	24.20488
2070	23.31934
2075	22.63144
2080	22.26974
2085	22.00908
2090	21.57359
2095	21.00488
2100	20.501