Year	Percent
1950	30.59184
1955	29.13966
1960	27.6671
1965	26.03158
1970	24.48872
1975	25.23644
1980	25.57303
1985	26.0582
1990	26.47141
1995	26.31227
2000	26.74273
2005	26.92158
2010	27.06536
2015	27.12524
2020	27.22269
2025	27.80417
2030	28.68009
2035	29.41468
2040	29.97262
2045	30.28238
2050	30.4036
2055	30.56831
2060	30.72456
2065	30.77032
2070	30.66183
2075	30.42995
2080	30.12235
2085	29.78334
2090	29.43563
2095	29.06863
2100	28.68077