Year	Percent
1950	29.18854
1955	29.05221
1960	28.5835
1965	28.93086
1970	27.90958
1975	25.60816
1980	24.1691
1985	23.67089
1990	24.30912
1995	25.36529
2000	26.83454
2005	28.76766
2010	30.65051
2015	32.0018
2020	31.20867
2025	30.23121
2030	29.89447
2035	30.54869
2040	31.23842
2045	31.44329
2050	30.94443
2055	29.86988
2060	28.98837
2065	28.5025
2070	28.18548
2075	27.81198
2080	27.27209
2085	26.60831
2090	25.93202
2095	25.34823
2100	24.86985