Year	Percent
1950	29.34606
1955	28.52693
1960	27.97805
1965	27.23147
1970	27.11419
1975	27.20837
1980	28.66604
1985	28.87745
1990	28.33809
1995	27.63543
2000	26.19548
2005	25.24987
2010	25.18416
2015	25.87476
2020	26.94643
2025	27.83027
2030	28.64785
2035	29.30548
2040	29.87533
2045	30.50703
2050	30.97991
2055	31.33048
2060	31.46188
2065	31.50635
2070	31.50757
2075	31.46008
2080	31.35556
2085	31.17122
2090	30.92285
2095	30.6469
2100	30.35516