Year	Percent
1950	15.56637
1955	15.28168
1960	15.56788
1965	15.69454
1970	15.85178
1975	16.04551
1980	16.08356
1985	15.77849
1990	15.26061
1995	14.48283
2000	13.94068
2005	12.66351
2010	12.17553
2015	12.41705
2020	12.05446
2025	11.3516
2030	10.61502
2035	10.07638
2040	9.62133
2045	9.15509
2050	8.63527
2055	8.12681
2060	7.65826
2065	7.23276
2070	6.88811
2075	6.58964
2080	6.32066
2085	6.085
2090	5.8738
2095	5.69657
2100	5.54564