Year	Percent
1950	11.73705
1955	10.10255
1960	9.27719
1965	9.55924
1970	9.91476
1975	11.1678
1980	11.2861
1985	12.40428
1990	15.00138
1995	15.2844
2000	15.91547
2005	15.93878
2010	16.4245
2015	19.2109
2020	22.11185
2025	25.32003
2030	26.65453
2035	28.22044
2040	30.38772
2045	33.60201
2050	38.77835
2055	41.8809
2060	42.7427
2065	42.27482
2070	42.18448
2075	42.24037
2080	41.77246
2085	40.9861
2090	40.2499
2095	39.68201
2100	39.37236