Year	Percent
1950	11.39524
1955	14.02015
1960	15.92633
1965	15.60405
1970	14.97509
1975	13.42513
1980	12.03299
1985	11.16619
1990	10.21307
1995	10.43541
2000	10.31411
2005	9.66932
2010	9.1869
2015	8.23768
2020	7.74444
2025	7.46069
2030	7.25069
2035	6.94588
2040	6.56708
2045	6.18932
2050	5.87859
2055	5.67141
2060	5.53288
2065	5.39181
2070	5.21357
2075	5.02247
2080	4.855
2085	4.74398
2090	4.67936
2095	4.62779
2100	4.57597