Year	Percent
1950	16.62381
1955	16.95423
1960	16.76535
1965	15.5951
1970	15.36586
1975	14.51865
1980	14.17528
1985	14.74293
1990	16.39534
1995	19.06945
2000	22.10792
2005	24.98655
2010	25.81282
2015	26.05601
2020	26.59673
2025	28.36962
2030	30.46221
2035	30.64992
2040	29.39524
2045	27.11544
2050	26.23661
2055	27.05013
2060	28.09331
2065	28.11173
2070	27.1541
2075	26.05037
2080	25.66201
2085	25.86626
2090	26.1744
2095	26.14687
2100	25.71719