Year	Percent
1950	30.92815
1955	27.46264
1960	22.61862
1965	20.42885
1970	22.32131
1975	26.85676
1980	30.49445
1985	35.73111
1990	37.61421
1995	36.30759
2000	32.1865
2005	30.26769
2010	28.33012
2015	26.57796
2020	25.51474
2025	24.88433
2030	24.70126
2035	24.58442
2040	24.57878
2045	24.34144
2050	24.14492
2055	23.94975
2060	23.76808
2065	23.59934
2070	23.42763
2075	23.24691
2080	23.03623
2085	22.82449
2090	22.63792
2095	22.48902
2100	22.37701