Year	Percent
1950	15.68247
1955	19.09783
1960	20.09589
1965	20.12753
1970	19.871
1975	19.59139
1980	19.43752
1985	18.67488
1990	16.03735
1995	14.30406
2000	13.07584
2005	12.07759
2010	11.77206
2015	11.82533
2020	10.84379
2025	9.8457
2030	8.9845
2035	8.35846
2040	7.91566
2045	7.55151
2050	7.18471
2055	6.81329
2060	6.48429
2065	6.22484
2070	6.0463
2075	5.91522
2080	5.79818
2085	5.66903
2090	5.5435
2095	5.44419
2100	5.37913