Year	Percent
1950	16.73343
1955	17.00824
1960	17.34922
1965	17.87206
1970	18.33438
1975	18.72818
1980	18.81076
1985	18.45912
1990	17.82515
1995	16.87551
2000	16.31007
2005	16.61688
2010	16.45524
2015	15.57467
2020	14.65697
2025	13.94024
2030	13.41439
2035	12.89631
2040	12.33245
2045	11.74597
2050	11.16956
2055	10.66992
2060	10.19679
2065	9.77479
2070	9.34687
2075	8.92533
2080	8.53439
2085	8.17424
2090	7.81864
2095	7.50582
2100	7.21481