Year	Percent
1950	17.22485
1955	18.18649
1960	18.8301
1965	19.16428
1970	19.47814
1975	19.50687
1980	19.56728
1985	18.65955
1990	17.87903
1995	17.33691
2000	17.25461
2005	16.9758
2010	16.50437
2015	16.29125
2020	15.99382
2025	15.47939
2030	14.88172
2035	14.32897
2040	13.79489
2045	13.27068
2050	12.74596
2055	12.22535
2060	11.75247
2065	11.29204
2070	10.85574
2075	10.42426
2080	10.02662
2085	9.63519
2090	9.27548
2095	8.9026
2100	8.558