Year	Percent
1950	27.76843
1955	26.95875
1960	26.59688
1965	25.37857
1970	26.24105
1975	28.43546
1980	29.95779
1985	32.01271
1990	32.26944
1995	32.24716
2000	32.39462
2005	32.90685
2010	33.47305
2015	35.0308
2020	35.51924
2025	33.75664
2030	30.92817
2035	28.43433
2040	27.06184
2045	26.61986
2050	26.36816
2055	25.67791
2060	24.50909
2065	23.29211
2070	22.48163
2075	22.19656
2080	22.20633
2085	22.17921
2090	21.91845
2095	21.48447
2100	21.08894