Year	Percent
1950	8.32561
1955	9.04123
1960	8.17482
1965	8.11125
1970	8.4632
1975	8.28719
1980	6.95803
1985	5.8858
1990	5.97224
1995	6.14719
2000	6.30043
2005	5.71094
2010	5.06449
2015	5.04886
2020	5.17958
2025	5.29904
2030	5.16251
2035	4.95931
2040	4.77944
2045	4.71533
2050	4.77671
2055	4.9019
2060	4.97793
2065	4.96339
2070	4.88415
2075	4.81649
2080	4.79592
2085	4.80957
2090	4.82301
2095	4.80063
2100	4.73948