Year	Percent
1950	13.41826
1955	14.65321
1960	15.52093
1965	15.37726
1970	15.45819
1975	15.06845
1980	12.92889
1985	12.6566
1990	12.34347
1995	11.48127
2000	10.67781
2005	9.51909
2010	8.90059
2015	8.09744
2020	7.40088
2025	6.86488
2030	6.3693
2035	5.98319
2040	5.6736
2045	5.42837
2050	5.23952
2055	5.08006
2060	4.9532
2065	4.85107
2070	4.77727
2075	4.72716
2080	4.7002
2085	4.67909
2090	4.67045
2095	4.66433
2100	4.66337