Year	Percent
1950	28.88324
1955	29.26947
1960	26.54518
1965	25.70172
1970	23.85227
1975	22.33571
1980	23.75973
1985	23.89438
1990	24.4167
1995	23.84577
2000	25.62472
2005	27.11373
2010	29.14583
2015	29.54428
2020	28.58367
2025	27.34391
2030	26.06842
2035	25.90948
2040	25.53496
2045	24.27422
2050	22.9698
2055	21.92989
2060	22.02863
2065	22.4841
2070	22.87599
2075	22.90341
2080	22.52441
2085	22.09615
2090	21.87207
2095	21.90085
2100	21.99924