Year	Percent
1950	6.07353
1955	6.35353
1960	7.87178
1965	8.2931
1970	7.05377
1975	6.74193
1980	7.07357
1985	7.27696
1990	6.83588
1995	5.98301
2000	5.92847
2005	6.72198
2010	7.08463
2015	5.36448
2020	5.45857
2025	5.89094
2030	5.81224
2035	5.99179
2040	5.97694
2045	5.7231
2050	5.49771
2055	5.50238
2060	5.61332
2065	5.68603
2070	5.67322
2075	5.57893
2080	5.46476
2085	5.40593
2090	5.40793
2095	5.41785
2100	5.39405