Year	Percent
1950	17.28193
1955	18.16484
1960	17.49536
1965	16.14358
1970	15.50669
1975	13.90948
1980	15.06915
1985	13.12328
1990	10.8384
1995	9.73756
2000	9.25934
2005	7.89004
2010	5.06176
2015	5.13363
2020	4.82741
2025	4.5335
2030	4.24613
2035	3.97908
2040	3.81144
2045	3.79932
2050	3.80854
2055	3.80209
2060	3.75122
2065	3.68955
2070	3.65904
2075	3.66964
2080	3.71922
2085	3.7713
2090	3.80801
2095	3.831
2100	3.84839