Year	Percent
1950	13.86103
1955	14.16526
1960	14.18336
1965	14.14122
1970	14.08517
1975	14.73634
1980	14.28448
1985	13.94532
1990	13.74695
1995	13.13087
2000	13.54249
2005	14.91624
2010	16.91657
2015	19.30951
2020	21.7692
2025	23.82714
2030	25.44562
2035	26.87784
2040	27.68252
2045	27.98913
2050	27.76841
2055	27.35382
2060	26.73456
2065	25.94803
2070	25.30105
2075	24.63438
2080	23.89594
2085	23.22402
2090	22.68201
2095	22.29025
2100	22.01672