Year	Percent
1950	8.27924
1955	8.94799
1960	8.14437
1965	8.02122
1970	8.49255
1975	8.16709
1980	7.54631
1985	6.25103
1990	5.29342
1995	4.91727
2000	4.78122
2005	4.61292
2010	4.67653
2015	4.72289
2020	4.34386
2025	4.16695
2030	4.09538
2035	4.1438
2040	4.25257
2045	4.35083
2050	4.38934
2055	4.38187
2060	4.39123
2065	4.45332
2070	4.54681
2075	4.62311
2080	4.65437
2085	4.63904
2090	4.59666
2095	4.56603
2100	4.55645