Year	Percent
1950	14.79932
1955	13.67168
1960	12.51149
1965	13.42404
1970	14.71446
1975	15.30416
1980	16.74478
1985	15.68419
1990	15.85234
1995	13.44006
2000	13.08429
2005	12.74926
2010	12.236
2015	12.03414
2020	11.66425
2025	10.64699
2030	9.86592
2035	9.19782
2040	8.72144
2045	8.33814
2050	7.91903
2055	7.45246
2060	6.97783
2065	6.59839
2070	6.30252
2075	6.07698
2080	5.86731
2085	5.65169
2090	5.44363
2095	5.27306
2100	5.14855