Year	Percent
1950	28.63979
1955	29.11857
1960	29.29149
1965	28.95424
1970	27.72866
1975	27.12773
1980	26.64354
1985	26.34002
1990	26.81514
1995	27.47023
2000	28.03546
2005	28.49865
2010	28.63713
2015	28.52803
2020	28.89384
2025	29.55487
2030	30.25268
2035	30.83528
2040	31.00045
2045	30.89882
2050	30.78712
2055	30.69652
2060	30.52572
2065	30.22921
2070	29.83835
2075	29.40341
2080	28.94702
2085	28.50364
2090	28.05231
2095	27.57988
2100	27.08599