Year	Percent
1950	9.03597
1955	7.16347
1960	6.4832
1965	6.48289
1970	7.1191
1975	8.1589
1980	8.0857
1985	9.07705
1990	12.13687
1995	14.27063
2000	15.66794
2005	16.82622
2010	17.96548
2015	20.20231
2020	22.30067
2025	24.3892
2030	26.45953
2035	28.31522
2040	30.35866
2045	32.65803
2050	34.81665
2055	36.50265
2060	37.0757
2065	37.21576
2070	36.94163
2075	36.92922
2080	37.08224
2085	37.29661
2090	37.458
2095	37.54212
2100	37.64048