Year	Percent
1950	15.03558
1955	14.9097
1960	14.73573
1965	14.5455
1970	14.33287
1975	14.04621
1980	13.68575
1985	13.52455
1990	13.20957
1995	13.30663
2000	13.05847
2005	12.70067
2010	12.62767
2015	12.73762
2020	12.99888
2025	13.35144
2030	13.68135
2035	14.2169
2040	15.06325
2045	16.12605
2050	17.28635
2055	18.34045
2060	19.20242
2065	19.97852
2070	20.73214
2075	21.46049
2080	22.13677
2085	22.67268
2090	23.05976
2095	23.33357
2100	23.55046