Year	Percent
1950	12.53583
1955	16.87803
1960	18.45212
1965	17.90979
1970	16.80971
1975	16.27575
1980	15.22351
1985	14.65392
1990	13.99726
1995	12.71652
2000	9.40321
2005	8.37896
2010	8.71448
2015	8.82561
2020	8.19973
2025	7.61933
2030	6.7101
2035	6.10756
2040	5.94622
2045	5.99272
2050	5.97717
2055	5.82355
2060	5.57569
2065	5.3551
2070	5.2731
2075	5.31869
2080	5.37789
2085	5.36835
2090	5.27952
2095	5.17298
2100	5.11181