Year	Percent
1950	11.74775
1955	12.3867
1960	12.16626
1965	10.48057
1970	11.23938
1975	11.81096
1980	12.20476
1985	12.26657
1990	12.16484
1995	11.88748
2000	12.41876
2005	12.69095
2010	12.77164
2015	12.4234
2020	12.23271
2025	11.96392
2030	11.73273
2035	11.45219
2040	11.08144
2045	10.66552
2050	10.27206
2055	9.93548
2060	9.61826
2065	9.29908
2070	8.96895
2075	8.64889
2080	8.35184
2085	8.07702
2090	7.81581
2095	7.55555
2100	7.31063