Year	Percent
1950	30.10393
1955	29.64517
1960	29.2001
1965	28.39889
1970	27.83325
1975	28.28499
1980	28.74919
1985	29.42411
1990	30.04097
1995	30.28355
2000	30.67006
2005	31.38363
2010	32.05726
2015	32.43157
2020	32.46559
2025	32.00944
2030	31.26972
2035	30.18281
2040	29.1557
2045	28.13913
2050	27.20611
2055	26.5878
2060	25.84488
2065	25.07626
2070	24.35942
2075	23.77543
2080	23.3325
2085	22.95691
2090	22.59422
2095	22.24884
2100	21.95045