Year	Percent
1950	13.63517
1955	14.45027
1960	16.84084
1965	17.0954
1970	17.43521
1975	15.03498
1980	13.60794
1985	12.69036
1990	12.6756
1995	11.5936
2000	9.8157
2005	7.44834
2010	6.21572
2015	5.88749
2020	5.58364
2025	5.2261
2030	4.87085
2035	4.50008
2040	4.17549
2045	3.98999
2050	3.91549
2055	3.89067
2060	3.85324
2065	3.79964
2070	3.75592
2075	3.75289
2080	3.80441
2085	3.88492
2090	3.96513
2095	4.01609
2100	4.04726