Year	Percent
1950	15.39653
1955	16.54842
1960	15.61964
1965	15.87172
1970	16.27995
1975	17.7311
1980	19.6546
1985	20.17967
1990	21.15304
1995	22.72547
2000	24.25996
2005	26.05871
2010	27.63265
2015	27.77412
2020	28.13237
2025	29.04477
2030	29.82666
2035	30.41591
2040	29.62496
2045	27.95861
2050	25.92695
2055	24.55191
2060	24.34966
2065	24.49935
2070	24.82334
2075	24.54068
2080	23.94901
2085	23.42544
2090	23.23265
2095	23.34601
2100	23.48646