Year	Percent
1950	28.08781
1955	25.73946
1960	26.45094
1965	26.85678
1970	27.81003
1975	29.02864
1980	30.02993
1985	33.33705
1990	35.11584
1995	35.16773
2000	33.14495
2005	33.01681
2010	32.89698
2015	33.03107
2020	32.83432
2025	30.49366
2030	28.81433
2035	27.12245
2040	26.28062
2045	26.51042
2050	26.1123
2055	25.33053
2060	24.45888
2065	23.74344
2070	23.32618
2075	23.17036
2080	23.10085
2085	22.91884
2090	22.59226
2095	22.24943
2100	22.00584