Year	Percent
1950	7.50078
1955	8.07503
1960	7.36113
1965	7.38216
1970	7.78157
1975	7.51999
1980	6.23715
1985	5.344
1990	5.43003
1995	5.5894
2000	5.66373
2005	5.18239
2010	4.62308
2015	4.69352
2020	4.82926
2025	4.99456
2030	4.8686
2035	4.67604
2040	4.50277
2045	4.43616
2050	4.48643
2055	4.59776
2060	4.66775
2065	4.65832
2070	4.58739
2075	4.52507
2080	4.50775
2085	4.52452
2090	4.54141
2095	4.52396
2100	4.4672