Year	Percent
1950	17.20914
1955	18.91054
1960	20.37653
1965	19.2391
1970	17.03356
1975	15.38491
1980	12.36352
1985	12.94856
1990	12.80014
1995	12.23824
2000	11.30274
2005	10.32356
2010	9.51202
2015	9.07778
2020	8.54017
2025	8.03212
2030	7.56087
2035	7.12929
2040	6.76137
2045	6.47136
2050	6.23011
2055	6.02258
2060	5.82432
2065	5.64525
2070	5.49143
2075	5.35947
2080	5.262
2085	5.17672
2090	5.10333
2095	5.03289
2100	4.97248