Year	Percent
1950	10.13435
1955	10.29364
1960	10.47784
1965	10.49721
1970	9.98935
1975	9.86105
1980	9.45507
1985	9.80562
1990	10.20425
1995	10.21927
2000	10.86431
2005	10.66677
2010	11.22932
2015	11.79129
2020	11.42203
2025	10.65615
2030	10.36776
2035	10.04642
2040	9.67336
2045	9.20646
2050	8.74142
2055	8.28252
2060	7.888
2065	7.51767
2070	7.16754
2075	6.83881
2080	6.54661
2085	6.28548
2090	6.06846
2095	5.87828
2100	5.71989