Year	Percent
1950	17.51649
1955	19.66517
1960	19.10648
1965	18.4181
1970	18.26093
1975	18.46234
1980	18.75407
1985	18.45962
1990	17.5063
1995	17.54018
2000	16.91056
2005	15.83178
2010	13.85378
2015	12.74505
2020	11.95173
2025	11.13363
2030	10.30468
2035	9.51335
2040	8.80607
2045	8.18668
2050	7.65247
2055	7.18376
2060	6.77576
2065	6.39916
2070	6.07793
2075	5.80301
2080	5.58464
2085	5.4015
2090	5.2535
2095	5.12406
2100	5.0106