Year	Percent
1950	12.98077
1955	13.70162
1960	14.31638
1965	15.9114
1970	17.77362
1975	16.42722
1980	15.01267
1985	14.10559
1990	12.37906
1995	11.89372
2000	11.02906
2005	9.55691
2010	7.58952
2015	6.17135
2020	5.87794
2025	5.61629
2030	5.29702
2035	4.97697
2040	4.63576
2045	4.32977
2050	4.1612
2055	4.11096
2060	4.10233
2065	4.07713
2070	4.0284
2075	3.99015
2080	3.99404
2085	4.05316
2090	4.13372
2095	4.2094
2100	4.24733