Year	Percent
1950	18.58386
1955	20.17994
1960	20.37142
1965	19.44489
1970	17.91389
1975	16.44467
1980	15.22959
1985	14.60111
1990	13.75226
1995	13.01002
2000	11.91024
2005	11.40659
2010	10.76795
2015	10.08914
2020	9.34379
2025	8.67235
2030	8.07783
2035	7.54922
2040	7.06628
2045	6.63313
2050	6.25443
2055	5.92697
2060	5.65215
2065	5.42302
2070	5.23255
2075	5.06437
2080	4.92524
2085	4.8089
2090	4.7175
2095	4.64784
2100	4.59418