Year	Percent
1950	12.69148
1955	8.58628
1960	9.10606
1965	11.6242
1970	13.31595
1975	13.58055
1980	12.78742
1985	12.17265
1990	12.07651
1995	11.83918
2000	12.87345
2005	12.32287
2010	9.53829
2015	9.00944
2020	8.93524
2025	10.70686
2030	9.93082
2035	8.87745
2040	8.02233
2045	7.7435
2050	7.86859
2055	7.92378
2060	7.66679
2065	7.20314
2070	6.81378
2075	6.63527
2080	6.60335
2085	6.5817
2090	6.46151
2095	6.25883
2100	6.06559