Year	Percent
1950	8.26094
1955	7.90296
1960	8.92648
1965	8.39017
1970	7.79541
1975	7.20293
1980	7.04406
1985	7.35207
1990	7.3843
1995	6.66007
2000	6.47768
2005	5.27576
2010	4.14685
2015	4.39448
2020	5.09208
2025	4.98099
2030	4.97754
2035	4.87995
2040	4.67908
2045	4.59189
2050	4.78791
2055	5.0349
2060	5.12832
2065	5.09948
2070	5.02038
2075	4.97352
2080	5.018
2085	5.11286
2090	5.1629
2095	5.12325
2100	5.03501