Year	Percent
1950	19.10038
1955	20.35036
1960	19.37293
1965	17.49438
1970	16.67053
1975	17.88079
1980	16.82653
1985	15.22669
1990	15.78321
1995	20.02769
2000	26.66953
2005	31.15598
2010	32.99241
2015	32.17582
2020	29.61595
2025	29.26013
2030	30.94618
2035	30.82308
2040	30.00545
2045	25.97297
2050	21.86586
2055	20.4621
2060	21.19722
2065	22.97761
2070	24.06788
2075	23.84752
2080	22.88726
2085	22.14491
2090	21.96034
2095	22.22958
2100	22.53558