Year	Percent
1950	13.9977
1955	14.19319
1960	14.94421
1965	14.95111
1970	15.0812
1975	15.32701
1980	15.28153
1985	15.35621
1990	15.5444
1995	15.83668
2000	16.27088
2005	16.26483
2010	16.28374
2015	15.9812
2020	15.46479
2025	14.95186
2030	14.43433
2035	13.89202
2040	13.28837
2045	12.64699
2050	12.02325
2055	11.42668
2060	10.86541
2065	10.3242
2070	9.80057
2075	9.30946
2080	8.85134
2085	8.42261
2090	8.02707
2095	7.65763
2100	7.31655