Year	Percent
1950	13.25565
1955	12.68323
1960	13.2364
1965	15.12328
1970	13.88374
1975	12.25312
1980	11.38145
1985	9.40781
1990	8.64877
1995	6.44922
2000	6.91109
2005	6.22842
2010	4.85074
2015	4.37522
2020	4.19802
2025	4.20491
2030	4.20676
2035	4.23581
2040	4.06365
2045	3.73942
2050	3.60487
2055	3.68989
2060	3.87726
2065	4.06817
2070	4.18145
2075	4.15656
2080	4.05102
2085	4.02162
2090	4.10682
2095	4.24682
2100	4.35382