Year	Percent
1950	29.15359
1955	28.32805
1960	27.50825
1965	26.58827
1970	25.49234
1975	25.60829
1980	27.59389
1985	28.09346
1990	27.82832
1995	24.65459
2000	23.28182
2005	25.81942
2010	27.87319
2015	29.0622
2020	28.99318
2025	28.47019
2030	28.5773
2035	29.29049
2040	30.4442
2045	31.21594
2050	31.19358
2055	30.92806
2060	30.77752
2065	30.85187
2070	30.97558
2075	30.88896
2080	30.53407
2085	30.08782
2090	29.7235
2095	29.46389
2100	29.21483