Year	Percent
1950	17.49537
1955	16.3162
1960	16.63274
1965	17.32932
1970	18.94414
1975	19.74085
1980	21.05399
1985	21.47954
1990	21.5899
1995	20.11689
2000	17.62902
2005	16.32161
2010	15.57975
2015	14.92285
2020	13.80665
2025	12.62443
2030	11.55393
2035	10.64505
2040	9.82767
2045	9.08448
2050	8.39549
2055	7.7263
2060	7.13973
2065	6.66345
2070	6.27825
2075	5.97675
2080	5.73811
2085	5.54139
2090	5.3792
2095	5.24854
2100	5.14793