Year	Percent
1950	10.65456
1955	8.77745
1960	7.07065
1965	9.4896
1970	10.06617
1975	8.21008
1980	7.67093
1985	7.62046
1990	7.93574
1995	8.19305
2000	7.3793
2005	7.60529
2010	6.93173
2015	6.42838
2020	6.28155
2025	5.86975
2030	5.76914
2035	5.77747
2040	5.73656
2045	5.62979
2050	5.50655
2055	5.40658
2060	5.33895
2065	5.32818
2070	5.32921
2075	5.2971
2080	5.24527
2085	5.18454
2090	5.14521
2095	5.12922
2100	5.11878