Year	Percent
1950	18.6144
1955	17.27545
1960	18.29345
1965	20.49081
1970	19.68436
1975	20.01703
1980	18.50939
1985	17.59712
1990	16.79908
1995	14.82546
2000	14.63694
2005	13.66375
2010	13.58434
2015	13.12231
2020	11.90588
2025	10.86963
2030	10.04002
2035	9.43114
2040	8.95553
2045	8.44411
2050	7.89001
2055	7.34347
2060	6.90914
2065	6.57051
2070	6.30631
2075	6.05878
2080	5.80646
2085	5.5646
2090	5.36517
2095	5.21664
2100	5.11092