Year	Percent
1950	20.06526
1955	21.87452
1960	20.46512
1965	20.81849
1970	22.00693
1975	22.25869
1980	24.12685
1985	22.18734
1990	21.11046
1995	22.78985
2000	24.80688
2005	27.42998
2010	28.44609
2015	27.35662
2020	27.05228
2025	27.74601
2030	32.14272
2035	34.21313
2040	33.43645
2045	30.37633
2050	25.84642
2055	23.76595
2060	23.53663
2065	24.05257
2070	23.63495
2075	22.62039
2080	22.10078
2085	22.22691
2090	22.65595
2095	23.04446
2100	23.07925