Year	Percent
1950	9.73723
1955	9.29797
1960	8.64306
1965	8.70708
1970	9.07181
1975	9.28871
1980	8.42459
1985	8.78739
1990	12.06234
1995	13.30019
2000	14.57619
2005	13.80852
2010	14.23721
2015	15.39862
2020	17.51697
2025	19.24002
2030	19.92134
2035	20.76573
2040	21.89454
2045	23.77795
2050	25.93966
2055	26.65525
2060	26.00999
2065	25.36353
2070	25.61922
2075	26.69841
2080	27.66586
2085	28.36945
2090	28.69456
2095	28.8662
2100	29.22277