Year	Percent
1950	28.77538
1955	27.74277
1960	26.00427
1965	23.77388
1970	22.96679
1975	23.12361
1980	23.92611
1985	25.03559
1990	25.9198
1995	27.407
2000	28.5597
2005	30.10121
2010	31.15729
2015	31.30912
2020	31.50792
2025	31.64533
2030	31.98394
2035	32.25172
2040	32.06758
2045	31.66638
2050	31.12356
2055	30.8087
2060	30.46685
2065	30.042
2070	29.53392
2075	28.9795
2080	28.42913
2085	27.89439
2090	27.3456
2095	26.7615
2100	26.15556