Year	Percent
1950	53.11975
1955	47.056
1960	40.8652
1965	38.70372
1970	36.55327
1975	35.87982
1980	35.33962
1985	37.09111
1990	38.55934
1995	35.95723
2000	32.7672
2005	29.56853
2010	28.07598
2015	28.17157
2020	29.28918
2025	30.01942
2030	29.58201
2035	28.37917
2040	27.05903
2045	26.23043
2050	25.87215
2055	25.50337
2060	24.89674
2065	24.05283
2070	23.19832
2075	22.52761
2080	22.08211
2085	21.77879
2090	21.49075
2095	21.13946
2100	20.76997