Year	Percent
1950	29.66697
1955	27.05754
1960	25.89717
1965	25.30472
1970	23.82925
1975	25.01914
1980	24.92053
1985	24.73624
1990	25.88564
1995	27.21541
2000	29.3939
2005	30.50011
2010	30.08606
2015	29.98341
2020	29.84911
2025	29.74124
2030	29.85775
2035	30.22331
2040	30.40455
2045	30.5755
2050	30.53335
2055	30.3053
2060	30.14497
2065	30.02111
2070	29.86333
2075	29.63106
2080	29.31494
2085	28.97242
2090	28.61335
2095	28.24921
2100	27.87012