Year	Percent
1950	13.7648
1955	13.82137
1960	12.91551
1965	12.44271
1970	10.81355
1975	9.81968
1980	8.73641
1985	8.12534
1990	7.51829
1995	6.47883
2000	5.95688
2005	4.48627
2010	4.4549
2015	4.36944
2020	4.40591
2025	4.51133
2030	4.41474
2035	4.15552
2040	3.96168
2045	3.93898
2050	4.04398
2055	4.18341
2060	4.24953
2065	4.20997
2070	4.14615
2075	4.14993
2080	4.23928
2085	4.36182
2090	4.44313
2095	4.44849
2100	4.4029