Year	Percent
1950	10.52115
1955	10.34322
1960	9.05318
1965	8.56248
1970	9.94619
1975	9.77554
1980	9.57931
1985	8.28704
1990	8.18812
1995	7.49112
2000	7.72038
2005	7.13188
2010	6.82915
2015	6.34117
2020	5.90092
2025	5.90764
2030	5.61849
2035	5.3488
2040	5.18108
2045	5.0643
2050	4.98737
2055	4.94756
2060	4.90049
2065	4.8385
2070	4.78486
2075	4.75575
2080	4.75547
2085	4.76603
2090	4.76903
2095	4.75961
2100	4.74045