Year	Percent
1950	17.75497
1955	17.79309
1960	17.44737
1965	16.87675
1970	15.95376
1975	15.73509
1980	16.14695
1985	17.09453
1990	17.81468
1995	18.68726
2000	20.03122
2005	21.64449
2010	24.70976
2015	26.56787
2020	26.30218
2025	25.15628
2030	24.51387
2035	24.40302
2040	24.99248
2045	25.59937
2050	25.41984
2055	24.90965
2060	24.68254
2065	24.6466
2070	24.69166
2075	24.41165
2080	24.04757
2085	23.68175
2090	23.36746
2095	23.12685
2100	22.95339