Year	Percent
1950	14.62688
1955	13.92609
1960	14.0495
1965	15.72275
1970	14.49521
1975	12.91947
1980	12.10549
1985	10.01681
1990	9.19554
1995	7.28175
2000	7.80686
2005	6.79631
2010	5.30525
2015	4.66599
2020	4.48618
2025	4.50329
2030	4.51986
2035	4.57156
2040	4.41099
2045	4.08373
2050	3.95709
2055	4.06316
2060	4.27133
2065	4.47634
2070	4.59221
2075	4.55705
2080	4.43714
2085	4.40239
2090	4.49284
2095	4.63286
2100	4.73228