Year	Percent
1950	28.14059
1955	27.24095
1960	26.50343
1965	26.1481
1970	26.11818
1975	27.53695
1980	29.69276
1985	29.47424
1990	29.42853
1995	33.57232
2000	34.84017
2005	36.71247
2010	45.81224
2015	50.57936
2020	50.78399
2025	44.8899
2030	38.9607
2035	34.9428
2040	33.93302
2045	33.29996
2050	30.63281
2055	27.40399
2060	24.75292
2065	23.42691
2070	23.1162
2075	23.10104
2080	22.93351
2085	22.46939
2090	21.90631
2095	21.52256
2100	21.43364