Year	Percent
1950	28.44498
1955	30.39932
1960	32.97904
1965	31.30955
1970	30.43684
1975	30.39811
1980	30.37437
1985	33.43111
1990	32.58452
1995	30.61456
2000	29.20367
2005	28.16773
2010	27.99797
2015	26.37018
2020	26.20403
2025	24.55208
2030	22.81017
2035	21.09875
2040	19.55897
2045	19.76463
2050	19.96317
2055	20.10829
2060	19.91138
2065	19.46921
2070	19.17793
2075	19.31534
2080	19.74092
2085	20.11323
2090	20.22032
2095	20.07178
2100	19.86369