Year	Percent
1950	12.49878
1955	12.55033
1960	12.85192
1965	12.98584
1970	13.5528
1975	14.05225
1980	14.43646
1985	14.76062
1990	15.26718
1995	15.25723
2000	14.75591
2005	14.21606
2010	14.2929
2015	14.34339
2020	14.00635
2025	13.37181
2030	12.78348
2035	12.24926
2040	11.7959
2045	11.33198
2050	10.88404
2055	10.42804
2060	9.97748
2065	9.54797
2070	9.16489
2075	8.82061
2080	8.47612
2085	8.14172
2090	7.82019
2095	7.51736
2100	7.23665