Year	Percent
1950	8.30904
1955	8.15375
1960	8.49173
1965	11.16399
1970	9.81347
1975	8.93666
1980	8.42792
1985	7.53273
1990	6.38298
1995	6.72094
2000	6.71573
2005	6.3548
2010	6.4835
2015	5.75053
2020	5.50991
2025	5.75233
2030	5.63995
2035	5.70033
2040	5.67016
2045	5.55552
2050	5.45637
2055	5.4398
2060	5.46615
2065	5.46545
2070	5.42215
2075	5.35908
2080	5.29068
2085	5.24815
2090	5.22543
2095	5.20491
2100	5.17333