Year	Percent
1950	16.64408
1955	17.26758
1960	17.0971
1965	16.90302
1970	15.50025
1975	14.29584
1980	14.0526
1985	13.56667
1990	12.02834
1995	10.79075
2000	10.02444
2005	8.7918
2010	7.70673
2015	7.22222
2020	6.67697
2025	6.15842
2030	5.71855
2035	5.37375
2040	5.09927
2045	4.88819
2050	4.73882
2055	4.6075
2060	4.49916
2065	4.42121
2070	4.37097
2075	4.35279
2080	4.35412
2085	4.36016
2090	4.3662
2095	4.37775
2100	4.3891