Year	Percent
1950	14.98881
1955	16.09834
1960	16.11048
1965	15.11864
1970	15.40325
1975	15.54594
1980	16.72289
1985	17.91982
1990	19.50107
1995	23.49224
2000	27.83051
2005	29.8498
2010	31.39077
2015	32.17929
2020	31.46809
2025	30.00276
2030	28.45407
2035	27.30245
2040	26.43872
2045	25.75097
2050	25.30446
2055	24.37579
2060	23.59363
2065	23.1544
2070	23.01729
2075	22.91146
2080	22.75502
2085	22.53694
2090	22.22906
2095	21.96318
2100	21.78163