Year	Percent
1950	28.28792
1955	27.38249
1960	25.97931
1965	25.30904
1970	23.7365
1975	24.1993
1980	24.34765
1985	25.87198
1990	27.80772
1995	28.35338
2000	29.5198
2005	31.14469
2010	32.63489
2015	33.0975
2020	32.56816
2025	31.63105
2030	31.61031
2035	32.40123
2040	32.83941
2045	32.76888
2050	32.0402
2055	30.92699
2060	30.1892
2065	29.68151
2070	29.14602
2075	28.40127
2080	27.5208
2085	26.61901
2090	25.80829
2095	25.13189
2100	24.53957