Year	Percent
1950	16.28035
1955	16.30311
1960	15.99515
1965	15.80022
1970	15.62143
1975	15.6052
1980	15.63121
1985	15.43801
1990	15.43701
1995	16.26571
2000	17.20591
2005	18.34753
2010	19.48217
2015	20.4207
2020	21.47058
2025	22.81851
2030	24.20159
2035	25.38517
2040	26.39987
2045	27.04445
2050	27.38643
2055	27.25542
2060	27.05022
2065	26.77047
2070	26.51509
2075	26.48398
2080	26.24331
2085	25.88127
2090	25.49244
2095	25.17548
2100	24.94621