Year	Percent
1950	13.14032
1955	12.82102
1960	14.67068
1965	14.62708
1970	14.47903
1975	14.41698
1980	13.98486
1985	13.24974
1990	12.67215
1995	12.2768
2000	11.62847
2005	10.98688
2010	10.11238
2015	9.71228
2020	9.25649
2025	8.72264
2030	8.18531
2035	7.68649
2040	7.2483
2045	6.86069
2050	6.51082
2055	6.19549
2060	5.9109
2065	5.66651
2070	5.45892
2075	5.28405
2080	5.14224
2085	5.02074
2090	4.91747
2095	4.82973
2100	4.75863