Year	Percent
1950	28.25282
1955	27.51935
1960	26.32795
1965	25.2318
1970	24.28066
1975	24.6525
1980	26.02568
1985	27.60286
1990	29.61952
1995	32.00305
2000	33.0622
2005	33.20051
2010	33.17586
2015	32.22612
2020	31.69511
2025	31.03386
2030	30.03884
2035	28.98035
2040	27.7126
2045	26.59533
2050	25.54506
2055	24.35813
2060	23.27936
2065	22.40011
2070	21.73364
2075	21.22872
2080	20.81009
2085	20.45721
2090	20.17029
2095	19.95243
2100	19.8191