Year	Percent
1950	8.97142
1955	9.6086
1960	8.71052
1965	9.16347
1970	8.53587
1975	8.4803
1980	7.68861
1985	7.61113
1990	6.75782
1995	5.39487
2000	5.04153
2005	4.97943
2010	4.82817
2015	5.16154
2020	4.55154
2025	4.04012
2030	3.7634
2035	3.77502
2040	3.90297
2045	4.05383
2050	4.10044
2055	4.01545
2060	3.9206
2065	3.93444
2070	4.06989
2075	4.24791
2080	4.37523
2085	4.40441
2090	4.36087
2095	4.32266
2100	4.33951