Year	Percent
1950	15.26533
1955	16.85451
1960	17.21486
1965	15.89201
1970	16.01373
1975	15.90389
1980	16.78991
1985	17.83663
1990	19.59346
1995	23.56556
2000	28.03066
2005	30.19183
2010	31.88626
2015	32.36954
2020	31.27482
2025	29.525
2030	28.08808
2035	27.21408
2040	26.77047
2045	26.41289
2050	26.0404
2055	25.15429
2060	24.35885
2065	23.926
2070	23.81677
2075	23.66542
2080	23.45978
2085	23.20295
2090	22.86696
2095	22.57823
2100	22.37741