Year	Percent
1950	16.00385
1955	16.64034
1960	17.03699
1965	17.55186
1970	17.90269
1975	18.16016
1980	18.17504
1985	17.42164
1990	16.6821
1995	16.27748
2000	16.49571
2005	16.68276
2010	16.75877
2015	16.43626
2020	15.23638
2025	14.5982
2030	14.28742
2035	13.97883
2040	13.44855
2045	12.76669
2050	12.14173
2055	11.63513
2060	11.18893
2065	10.75911
2070	10.28305
2075	9.79906
2080	9.35495
2085	8.94945
2090	8.59468
2095	8.23605
2100	7.89968