Year	Percent
1950	15.70283
1955	19.95211
1960	20.20932
1965	18.67652
1970	18.22697
1975	18.59082
1980	18.41584
1985	17.85896
1990	16.33733
1995	14.52783
2000	12.84698
2005	11.45531
2010	10.59464
2015	9.60072
2020	8.71369
2025	7.86263
2030	7.15702
2035	6.57726
2040	6.12117
2045	5.73729
2050	5.40532
2055	5.12412
2060	4.87896
2065	4.69286
2070	4.54974
2075	4.44096
2080	4.36668
2085	4.3058
2090	4.25963
2095	4.22489
2100	4.20458