Year	Percent
1950	28.1274
1955	27.96981
1960	27.44791
1965	26.65522
1970	25.9055
1975	25.55337
1980	25.55235
1985	26.22602
1990	26.6159
1995	27.2013
2000	28.14216
2005	28.28152
2010	28.51714
2015	28.89713
2020	29.30078
2025	29.78849
2030	30.05963
2035	30.20394
2040	30.2553
2045	30.25751
2050	30.34029
2055	30.37677
2060	30.27967
2065	30.08831
2070	29.86325
2075	29.64265
2080	29.39718
2085	29.12078
2090	28.80983
2095	28.47629
2100	28.15581