Year	Percent
1950	29.04523
1955	29.01293
1960	27.89039
1965	25.96339
1970	25.69396
1975	27.6574
1980	34.28479
1985	34.97096
1990	38.91879
1995	38.34928
2000	39.51435
2005	38.59836
2010	37.88304
2015	35.8625
2020	33.67123
2025	30.97035
2030	28.25457
2035	27.02678
2040	25.86784
2045	25.01547
2050	24.5391
2055	23.62131
2060	22.76143
2065	22.17472
2070	21.89394
2075	21.77972
2080	21.68998
2085	21.4962
2090	21.20481
2095	20.9456
2100	20.79929