Year	Percent
1950	10.50933
1955	9.97186
1960	9.39153
1965	9.17887
1970	9.3421
1975	9.94886
1980	10.55498
1985	11.40897
1990	13.67901
1995	14.29374
2000	14.92448
2005	16.23279
2010	18.41685
2015	20.98703
2020	23.89261
2025	26.63239
2030	27.99877
2035	28.81658
2040	29.41073
2045	30.10764
2050	30.58976
2055	31.38925
2060	31.72236
2065	31.80598
2070	32.27671
2075	32.77105
2080	33.24918
2085	33.67567
2090	34.06907
2095	34.45237
2100	34.89535