Year	Percent
1950	32.93041
1955	30.69357
1960	28.79221
1965	26.44125
1970	27.96328
1975	31.82303
1980	37.25373
1985	40.96545
1990	42.06317
1995	38.25437
2000	33.11407
2005	31.26389
2010	29.78045
2015	27.97745
2020	26.67767
2025	25.38469
2030	24.15058
2035	22.53795
2040	21.23547
2045	20.49479
2050	20.22072
2055	19.9881
2060	19.75687
2065	19.49413
2070	19.16537
2075	18.88924
2080	18.71628
2085	18.62607
2090	18.54871
2095	18.43809
2100	18.27639