Year	Percent
1950	14.85166
1955	14.80127
1960	14.76306
1965	15.18175
1970	15.98978
1975	14.78123
1980	13.09083
1985	12.83901
1990	12.4226
1995	12.22233
2000	11.20952
2005	10.29418
2010	9.69072
2015	9.19893
2020	8.69459
2025	8.14819
2030	7.61539
2035	7.15392
2040	6.74378
2045	6.39338
2050	6.09504
2055	5.82147
2060	5.59034
2065	5.39197
2070	5.22909
2075	5.09475
2080	4.98314
2085	4.88955
2090	4.81334
2095	4.74588
2100	4.69533