Year	Percent
1950	14.75001
1955	15.02076
1960	14.70652
1965	15.00211
1970	15.12421
1975	15.23362
1980	15.33707
1985	15.3722
1990	15.24435
1995	15.13954
2000	15.0635
2005	14.97082
2010	15.10288
2015	15.2917
2020	15.08363
2025	14.42442
2030	13.90262
2035	13.48146
2040	13.06701
2045	12.60563
2050	12.10857
2055	11.58986
2060	11.11355
2065	10.68189
2070	10.24952
2075	9.84462
2080	9.44104
2085	9.05823
2090	8.70257
2095	8.37892
2100	8.06479