Year	Percent
1950	9.60564
1955	9.44303
1960	10.04924
1965	9.71508
1970	10.57282
1975	10.35208
1980	10.28137
1985	10.52774
1990	11.04682
1995	11.33525
2000	11.26915
2005	10.84027
2010	10.59504
2015	10.66036
2020	11.23975
2025	11.73357
2030	11.50564
2035	11.1628
2040	10.99472
2045	10.88301
2050	10.69766
2055	10.40837
2060	10.04902
2065	9.66946
2070	9.32481
2075	8.99564
2080	8.70076
2085	8.40406
2090	8.10592
2095	7.82743
2100	7.55371