Year	Percent
1950	20.41091
1955	19.75743
1960	19.1273
1965	18.92696
1970	19.20059
1975	19.02646
1980	18.58654
1985	18.60569
1990	19.69472
1995	21.50402
2000	24.20133
2005	26.21678
2010	26.08077
2015	25.59782
2020	24.78644
2025	24.4904
2030	24.52892
2035	25.25134
2040	25.1079
2045	24.51954
2050	24.55553
2055	23.91672
2060	23.97506
2065	24.08437
2070	23.615
2075	23.19428
2080	22.86855
2085	22.63298
2090	22.50126
2095	22.39363
2100	22.22974