Year	Percent
1950	12.99228
1955	13.69479
1960	14.31308
1965	14.22444
1970	14.3324
1975	13.37996
1980	12.46138
1985	12.38971
1990	12.21473
1995	10.99886
2000	9.93547
2005	9.35513
2010	8.32285
2015	7.34712
2020	6.94227
2025	6.46918
2030	6.01049
2035	5.61818
2040	5.3119
2045	5.06942
2050	4.88441
2055	4.75835
2060	4.64901
2065	4.56075
2070	4.5008
2075	4.46579
2080	4.45907
2085	4.46804
2090	4.47713
2095	4.4827
2100	4.49198