Year	Percent
1950	28.12817
1955	28.29731
1960	28.28678
1965	28.19653
1970	27.94606
1975	27.4066
1980	27.12366
1985	26.50953
1990	26.40773
1995	26.93297
2000	27.70367
2005	28.24754
2010	28.3375
2015	28.05545
2020	27.91562
2025	28.26537
2030	29.00953
2035	29.9388
2040	30.60997
2045	30.97519
2050	31.18212
2055	31.28226
2060	31.37759
2065	31.37826
2070	31.21759
2075	30.90708
2080	30.47893
2085	30.00257
2090	29.52186
2095	29.03724
2100	28.55234