Year	Percent
1950	16.4848
1955	14.85465
1960	17.50206
1965	17.04163
1970	19.4426
1975	19.06919
1980	19.27351
1985	19.52395
1990	19.07187
1995	18.77817
2000	18.59463
2005	18.47656
2010	17.99873
2015	17.44689
2020	16.56116
2025	15.63807
2030	14.741
2035	13.87548
2040	13.00658
2045	12.12182
2050	11.27143
2055	10.50536
2060	9.83861
2065	9.24768
2070	8.7245
2075	8.23668
2080	7.79019
2085	7.39571
2090	7.06461
2095	6.76418
2100	6.52417