Year	Percent
1950	30.81563
1955	28.05436
1960	25.58589
1965	24.46337
1970	25.57922
1975	28.32552
1980	31.3398
1985	32.87841
1990	31.93252
1995	30.09862
2000	28.03422
2005	26.64917
2010	26.11292
2015	26.49776
2020	26.57163
2025	26.26397
2030	25.71658
2035	24.71046
2040	24.25882
2045	24.11462
2050	24.00933
2055	24.11044
2060	23.93683
2065	23.5576
2070	23.17682
2075	22.92938
2080	22.80445
2085	22.72149
2090	22.59462
2095	22.37992
2100	22.13272