Year	Percent
1950	13.6006
1955	15.06906
1960	13.42443
1965	12.30696
1970	11.81503
1975	10.50055
1980	9.80949
1985	9.4927
1990	8.6954
1995	7.9773
2000	6.69907
2005	6.02032
2010	5.44303
2015	5.57921
2020	5.53659
2025	5.33468
2030	5.02064
2035	4.72945
2040	4.59404
2045	4.61928
2050	4.70424
2055	4.73346
2060	4.66627
2065	4.56961
2070	4.52419
2075	4.56423
2080	4.65314
2085	4.71142
2090	4.71369
2095	4.66073
2100	4.60684