Year	Percent
1950	23.19229
1955	24.15689
1960	23.94836
1965	24.12283
1970	23.81372
1975	22.87849
1980	22.859
1985	22.54791
1990	24.81145
1995	26.77561
2000	28.23255
2005	29.08965
2010	27.23476
2015	25.18347
2020	24.18705
2025	23.50419
2030	23.21264
2035	24.07486
2040	23.89556
2045	23.38877
2050	23.29456
2055	22.78284
2060	22.92391
2065	23.14016
2070	22.95238
2075	22.74528
2080	22.47092
2085	22.25653
2090	22.15818
2095	22.11364
2100	22.015