Year	Percent
1950	10.47165
1955	10.68315
1960	10.64542
1965	9.53006
1970	9.92461
1975	10.06706
1980	10.09731
1985	10.16513
1990	10.46522
1995	10.80545
2000	10.91179
2005	10.48997
2010	10.08461
2015	10.57173
2020	10.92874
2025	10.76289
2030	10.3979
2035	10.17203
2040	10.00522
2045	9.83389
2050	9.61411
2055	9.35633
2060	9.0717
2065	8.79305
2070	8.53279
2075	8.27577
2080	8.03904
2085	7.78893
2090	7.53804
2095	7.29624
2100	7.05719