Year	Percent
1950	15.82906
1955	15.79448
1960	15.71171
1965	15.47204
1970	15.10685
1975	14.63723
1980	14.0635
1985	13.32161
1990	12.63116
1995	12.13214
2000	11.74495
2005	11.55572
2010	11.63022
2015	11.96288
2020	12.68001
2025	13.78894
2030	14.97637
2035	15.96075
2040	16.72684
2045	17.52235
2050	18.46576
2055	19.49413
2060	20.44691
2065	21.15305
2070	21.6276
2075	22.02371
2080	22.42556
2085	22.82626
2090	23.19271
2095	23.4866
2100	23.71577