Year	Percent
1950	27.27113
1955	26.73018
1960	27.55163
1965	26.9653
1970	27.77002
1975	28.60721
1980	31.57198
1985	34.56756
1990	37.02376
1995	38.03622
2000	36.11385
2005	34.20504
2010	30.4653
2015	28.50653
2020	26.94403
2025	24.3238
2030	22.45238
2035	20.00583
2040	18.50833
2045	18.40301
2050	18.89751
2055	19.3678
2060	19.38368
2065	19.09442
2070	18.7092
2075	18.61415
2080	19.0336
2085	19.66892
2090	20.07782
2095	20.06509
2100	19.71593