Year	Percent
1950	29.28473
1955	29.13171
1960	28.8443
1965	28.10995
1970	27.2225
1975	26.45555
1980	25.71013
1985	25.35022
1990	25.40563
1995	25.91825
2000	26.98198
2005	28.23331
2010	29.25676
2015	29.78304
2020	29.94657
2025	30.15793
2030	30.5943
2035	31.14853
2040	31.58773
2045	31.64648
2050	31.39702
2055	31.08774
2060	30.82982
2065	30.61205
2070	30.36909
2075	30.04694
2080	29.67
2085	29.26822
2090	28.88132
2095	28.50821
2100	28.14018