Year	Percent
1950	29.15696
1955	28.6147
1960	27.89295
1965	27.03009
1970	26.21224
1975	25.94498
1980	25.69503
1985	26.20797
1990	27.15655
1995	28.54817
2000	29.93613
2005	30.52602
2010	30.42187
2015	28.49847
2020	27.5986
2025	27.75553
2030	28.91084
2035	30.15229
2040	30.59748
2045	30.63444
2050	30.45536
2055	30.37227
2060	30.52856
2065	30.5606
2070	30.35614
2075	29.98903
2080	29.60877
2085	29.31608
2090	29.04767
2095	28.73638
2100	28.36424