Year	Percent
1950	12.16138
1955	10.91154
1960	15.18536
1965	13.31832
1970	14.07305
1975	15.83218
1980	15.41493
1985	15.12676
1990	14.83631
1995	14.38344
2000	13.83576
2005	13.82837
2010	13.38231
2015	13.24457
2020	13.24476
2025	12.70174
2030	12.16722
2035	11.72144
2040	11.3389
2045	10.98903
2050	10.6294
2055	10.24464
2060	9.86175
2065	9.47755
2070	9.14993
2075	8.81189
2080	8.48771
2085	8.15769
2090	7.83917
2095	7.53085
2100	7.23254