Year	Percent
1950	6.34726
1955	7.90461
1960	8.27128
1965	6.96881
1970	6.60431
1975	6.87362
1980	7.02572
1985	6.65588
1990	5.79941
1995	5.66552
2000	6.47708
2005	6.71951
2010	5.18259
2015	5.32132
2020	5.78882
2025	5.70727
2030	5.85626
2035	5.83729
2040	5.59405
2045	5.37869
2050	5.38728
2055	5.49545
2060	5.56797
2065	5.56048
2070	5.47193
2075	5.35837
2080	5.29901
2085	5.30595
2090	5.32615
2095	5.30597
2100	5.24108