Year	Percent
1950	26.68985
1955	25.17321
1960	24.32798
1965	23.82716
1970	24.16752
1975	26.22494
1980	27.62484
1985	28.74711
1990	29.39627
1995	28.89022
2000	28.88736
2005	30.02403
2010	31.53906
2015	33.25755
2020	34.05529
2025	33.22462
2030	32.03199
2035	30.77152
2040	29.68413
2045	29.1449
2050	28.48346
2055	27.75945
2060	26.86389
2065	26.00025
2070	25.31112
2075	24.69563
2080	24.16882
2085	23.71673
2090	23.29872
2095	22.89522
2100	22.51131