Year	Percent
1950	16.22419
1955	16.89572
1960	16.03136
1965	15.33917
1970	14.95097
1975	14.81235
1980	14.55466
1985	15.32223
1990	16.59635
1995	18.24704
2000	20.6308
2005	23.63866
2010	26.10808
2015	26.81314
2020	26.19837
2025	25.99923
2030	26.50448
2035	27.21475
2040	27.81802
2045	26.4891
2050	25.47321
2055	24.33854
2060	23.88537
2065	24.41501
2070	24.38426
2075	24.0158
2080	23.52314
2085	23.13258
2090	22.96148
2095	22.97267
2100	23.00097