Year	Percent
1950	32.27465
1955	29.34714
1960	25.50887
1965	25.77908
1970	27.72585
1975	28.17352
1980	32.88293
1985	34.79795
1990	34.43222
1995	31.19068
2000	30.42871
2005	29.58945
2010	29.65313
2015	28.05416
2020	27.80329
2025	28.67289
2030	29.9207
2035	30.13082
2040	29.56154
2045	28.76619
2050	28.06731
2055	27.71417
2060	27.57659
2065	27.35966
2070	26.92438
2075	26.32481
2080	25.70476
2085	25.18122
2090	24.76541
2095	24.39035
2100	23.97555