Year	Percent
1950	18.18213
1955	18.39371
1960	15.81166
1965	14.14057
1970	15.43405
1975	16.65803
1980	18.89782
1985	17.6987
1990	15.94118
1995	15.5397
2000	17.20986
2005	22.36996
2010	25.8343
2015	26.76185
2020	26.33832
2025	26.43494
2030	28.28063
2035	29.75134
2040	29.30697
2045	26.99019
2050	24.38182
2055	23.97366
2060	24.91551
2065	25.88041
2070	25.94332
2075	24.69064
2080	24.02277
2085	24.1333
2090	24.45612
2095	24.40846
2100	23.99551