Year	Percent
1950	15.10212
1955	13.58158
1960	12.49026
1965	12.53509
1970	13.68873
1975	14.61109
1980	14.59502
1985	13.466
1990	12.20755
1995	13.40068
2000	15.71913
2005	18.65165
2010	20.89683
2015	21.63861
2020	22.13537
2025	23.19461
2030	24.36888
2035	25.43249
2040	25.49933
2045	24.89668
2050	24.46685
2055	24.61685
2060	25.10703
2065	25.36215
2070	25.21342
2075	24.3795
2080	23.73035
2085	23.37144
2090	23.22521
2095	23.10854
2100	22.87208