Year	Percent
1950	19.75442
1955	20.90915
1960	21.56746
1965	21.55041
1970	23.02015
1975	23.59645
1980	24.63473
1985	24.3215
1990	24.17868
1995	23.77216
2000	24.8108
2005	26.52464
2010	27.77518
2015	29.821
2020	31.09967
2025	31.58554
2030	29.80923
2035	27.60548
2040	25.32494
2045	23.76115
2050	24.22801
2055	24.54695
2060	24.27564
2065	23.6228
2070	22.39201
2075	21.90575
2080	22.14063
2085	22.6659
2090	22.94284
2095	22.81338
2100	22.38323