Year	Percent
1950	17.52789
1955	14.6715
1960	15.28949
1965	15.76301
1970	15.61194
1975	16.45588
1980	14.19564
1985	15.16827
1990	14.06201
1995	13.11896
2000	11.64479
2005	10.20583
2010	9.68961
2015	9.99001
2020	9.13982
2025	8.47038
2030	7.84166
2035	7.32912
2040	6.961
2045	6.71487
2050	6.50258
2055	6.29432
2060	6.07701
2065	5.89581
2070	5.75608
2075	5.64879
2080	5.56345
2085	5.47583
2090	5.38556
2095	5.29494
2100	5.22082