Year	Percent
1950	26.82474
1955	25.26534
1960	26.39069
1965	26.3181
1970	26.418
1975	27.22574
1980	28.34663
1985	29.37507
1990	31.05168
1995	32.2688
2000	30.31868
2005	28.11273
2010	26.12186
2015	26.14347
2020	25.45324
2025	23.78722
2030	22.12635
2035	20.77203
2040	20.61758
2045	20.9267
2050	21.2709
2055	21.32351
2060	21.02373
2065	20.67566
2070	20.54915
2075	20.72082
2080	21.00576
2085	21.15851
2090	21.0537
2095	20.76673
2100	20.48123