Year	Percent
1950	14.12912
1955	14.00104
1960	15.06609
1965	15.22008
1970	15.33301
1975	14.99011
1980	14.95368
1985	14.89645
1990	13.80539
1995	13.17707
2000	13.41648
2005	12.94983
2010	11.0872
2015	10.16
2020	9.58102
2025	9.29861
2030	8.74545
2035	8.06696
2040	7.392
2045	6.83051
2050	6.43223
2055	6.14464
2060	5.87118
2065	5.58417
2070	5.3027
2075	5.08353
2080	4.93658
2085	4.85412
2090	4.79646
2095	4.74215
2100	4.67734