Year	Percent
1950	17.39882
1955	17.19621
1960	16.63479
1965	16.1933
1970	15.83251
1975	15.41921
1980	14.92679
1985	14.3374
1990	13.59152
1995	13.11995
2000	12.77962
2005	12.42655
2010	12.30134
2015	12.08268
2020	12.19384
2025	12.55782
2030	13.10131
2035	14.0074
2040	15.57228
2045	17.4587
2050	19.19065
2055	20.48713
2060	21.09881
2065	21.64991
2070	22.42058
2075	23.30444
2080	24.16825
2085	24.68031
2090	24.89767
2095	25.01804
2100	25.19521