Year	Percent
1950	13.79378
1955	17.43635
1960	17.25521
1965	16.54367
1970	15.08828
1975	14.25868
1980	14.43554
1985	13.5825
1990	11.95016
1995	11.17549
2000	9.76905
2005	8.00761
2010	6.26507
2015	7.94693
2020	7.52419
2025	7.15289
2030	6.57869
2035	5.68993
2040	4.93779
2045	4.5837
2050	4.63375
2055	4.82451
2060	4.87778
2065	4.67753
2070	4.39424
2075	4.23587
2080	4.28588
2085	4.44524
2090	4.56167
2095	4.54233
2100	4.42206