Year	Percent
1950	31.54266
1955	32.01673
1960	31.25812
1965	29.73505
1970	27.92177
1975	27.00033
1980	27.91075
1985	29.61032
1990	31.18856
1995	32.96419
2000	33.77791
2005	33.32998
2010	30.95462
2015	25.92859
2020	22.11704
2025	20.81093
2030	21.30618
2035	21.61724
2040	21.7306
2045	21.02285
2050	19.81135
2055	19.38351
2060	19.61898
2065	20.34546
2070	21.07222
2075	21.38792
2080	21.20155
2085	20.76279
2090	20.45337
2095	20.44232
2100	20.62733