Year	Percent
1950	29.26533
1955	29.31066
1960	28.21212
1965	26.30224
1970	25.88552
1975	27.87503
1980	35.4616
1985	35.61279
1990	39.36569
1995	37.72632
2000	38.38309
2005	38.40731
2010	38.32066
2015	36.34124
2020	34.13931
2025	31.17328
2030	28.34232
2035	27.16903
2040	25.96984
2045	25.16255
2050	24.71374
2055	23.81281
2060	22.95911
2065	22.37378
2070	22.09559
2075	21.98968
2080	21.90444
2085	21.71226
2090	21.41988
2095	21.15903
2100	21.01457