Year	Percent
1950	13.27812
1955	13.03001
1960	14.40708
1965	14.27915
1970	14.02926
1975	14.07381
1980	15.10109
1985	15.5274
1990	15.83019
1995	15.3277
2000	15.08808
2005	14.66002
2010	14.57923
2015	14.77884
2020	14.77139
2025	13.95379
2030	13.18707
2035	12.58637
2040	12.14407
2045	11.75345
2050	11.31848
2055	10.84807
2060	10.36003
2065	9.90784
2070	9.51786
2075	9.17094
2080	8.82366
2085	8.47951
2090	8.14117
2095	7.79483
2100	7.48475