Year	Percent
1950	10.37307
1955	10.3219
1960	10.39268
1965	10.81633
1970	11.37884
1975	12.49274
1980	12.93524
1985	13.56891
1990	16.51453
1995	17.14318
2000	17.35551
2005	17.86252
2010	18.44447
2015	19.14052
2020	20.1577
2025	21.24238
2030	22.12904
2035	23.48742
2040	25.05233
2045	26.13434
2050	27.5374
2055	29.25915
2060	30.77237
2065	32.00107
2070	33.05489
2075	33.97307
2080	34.80261
2085	35.55544
2090	36.20003
2095	36.73356
2100	37.19359