Year	Percent
1950	16.94366
1955	16.69097
1960	18.00117
1965	18.6208
1970	18.64936
1975	17.34783
1980	17.59319
1985	16.95774
1990	15.56269
1995	14.01207
2000	12.78231
2005	11.64886
2010	10.30705
2015	9.34522
2020	8.61721
2025	7.85427
2030	7.1471
2035	6.51753
2040	6.00314
2045	5.61879
2050	5.30908
2055	5.05058
2060	4.84035
2065	4.67122
2070	4.54725
2075	4.45357
2080	4.38953
2085	4.34887
2090	4.32136
2095	4.30876
2100	4.30687