Year	Percent
1950	29.31702
1955	25.85827
1960	25.13578
1965	23.27293
1970	22.56306
1975	21.83251
1980	22.76369
1985	26.64791
1990	28.78188
1995	28.70561
2000	30.86105
2005	32.80323
2010	31.43547
2015	32.87892
2020	34.2793
2025	34.62344
2030	33.6819
2035	32.41134
2040	31.26682
2045	30.39358
2050	29.95881
2055	29.29846
2060	28.32488
2065	27.30355
2070	26.46322
2075	25.83818
2080	25.33893
2085	24.8507
2090	24.33835
2095	23.8488
2100	23.42591