Year	Percent
1950	10.51707
1955	10.87869
1960	11.06436
1965	10.88292
1970	9.64546
1975	10.12827
1980	10.31515
1985	10.40434
1990	10.30971
1995	10.6809
2000	12.60241
2005	12.79057
2010	10.79148
2015	10.09301
2020	11.08517
2025	11.62122
2030	10.99347
2035	10.32986
2040	9.81375
2045	9.51949
2050	9.37533
2055	9.17643
2060	8.83691
2065	8.42346
2070	8.05578
2075	7.77742
2080	7.55316
2085	7.32182
2090	7.03929
2095	6.75426
2100	6.50121