Year	Percent
1950	15.34103
1955	16.75286
1960	18.17753
1965	19.36831
1970	20.14892
1975	20.45024
1980	19.08552
1985	19.69606
1990	24.07145
1995	23.38652
2000	23.80868
2005	24.92835
2010	25.77077
2015	26.64725
2020	28.60135
2025	31.39893
2030	34.1871
2035	35.75576
2040	36.65486
2045	37.99343
2050	39.04082
2055	39.7442
2060	39.5129
2065	39.08138
2070	38.73544
2075	38.61571
2080	38.76548
2085	38.97182
2090	39.15763
2095	39.32628
2100	39.55984