Year	Percent
1950	30.01783
1955	29.9673
1960	28.34038
1965	24.35836
1970	23.84059
1975	25.68902
1980	27.24692
1985	29.50069
1990	30.74711
1995	29.15661
2000	28.41207
2005	29.02176
2010	29.95112
2015	30.82004
2020	31.69002
2025	30.67894
2030	30.52227
2035	30.94832
2040	31.05991
2045	31.81302
2050	31.01621
2055	29.98321
2060	29.30045
2065	29.23499
2070	29.54065
2075	29.82077
2080	29.65417
2085	29.04412
2090	28.40907
2095	28.04581
2100	27.95756