Year	Percent
1950	16.5169
1955	17.05472
1960	17.47559
1965	17.44923
1970	16.82895
1975	15.95434
1980	14.66621
1985	13.50535
1990	12.65415
1995	11.83948
2000	11.4137
2005	10.73549
2010	10.28918
2015	9.90006
2020	9.21724
2025	8.64899
2030	8.17325
2035	7.73858
2040	7.33114
2045	6.96824
2050	6.63013
2055	6.32588
2060	6.06833
2065	5.85693
2070	5.66568
2075	5.50078
2080	5.35567
2085	5.22618
2090	5.11545
2095	5.02083
2100	4.94008