Year	Percent
1950	28.84016
1955	29.39386
1960	29.5024
1965	29.34647
1970	28.04974
1975	27.73901
1980	27.2763
1985	27.07175
1990	26.97376
1995	27.36927
2000	27.86224
2005	27.51749
2010	27.64269
2015	28.36271
2020	29.10147
2025	29.66814
2030	30.01716
2035	30.30585
2040	30.50629
2045	30.76058
2050	30.99606
2055	31.07807
2060	31.04017
2065	30.96423
2070	30.87248
2075	30.73956
2080	30.57815
2085	30.38841
2090	30.17736
2095	29.95276
2100	29.70871