Year	Percent
1950	41.87543
1955	37.81623
1960	32.76848
1965	28.25114
1970	26.33515
1975	27.33876
1980	34.5883
1985	38.26814
1990	38.25453
1995	36.21475
2000	32.18985
2005	28.90624
2010	27.70185
2015	27.11934
2020	25.55009
2025	22.57013
2030	21.06614
2035	19.9989
2040	20.76594
2045	23.01664
2050	24.3961
2055	24.70761
2060	23.67428
2065	22.40333
2070	21.59885
2075	21.827
2080	22.56954
2085	23.04838
2090	22.84494
2095	22.11121
2100	21.30098