Year	Percent
1950	19.35481
1955	18.48633
1960	18.39742
1965	17.32653
1970	16.13183
1975	15.74647
1980	15.8128
1985	15.95184
1990	16.77022
1995	19.45781
2000	21.78151
2005	25.40805
2010	29.34122
2015	30.80249
2020	30.94397
2025	30.32002
2030	30.31694
2035	28.93895
2040	27.83862
2045	26.29021
2050	23.22871
2055	22.64909
2060	23.36084
2065	23.81677
2070	23.65567
2075	22.95073
2080	22.48868
2085	22.53594
2090	22.80996
2095	22.97564
2100	22.88633