Year	Percent
1950	19.08466
1955	20.47927
1960	20.87571
1965	21.68815
1970	22.3506
1975	22.33285
1980	22.55913
1985	22.26896
1990	23.02768
1995	23.81934
2000	25.11686
2005	26.84558
2010	27.72568
2015	29.41273
2020	30.32173
2025	29.70771
2030	28.2862
2035	26.13671
2040	24.75448
2045	24.60988
2050	25.15222
2055	25.44781
2060	24.86281
2065	23.77298
2070	22.90677
2075	22.52163
2080	22.69146
2085	22.99122
2090	22.99598
2095	22.68947
2100	22.28408