Year	Percent
1950	6.04148
1955	5.60692
1960	5.35284
1965	5.16962
1970	5.04083
1975	5.84167
1980	5.18348
1985	5.17456
1990	5.66535
1995	5.98562
2000	5.64405
2005	6.17676
2010	6.80626
2015	8.06148
2020	9.33214
2025	9.96067
2030	10.14219
2035	9.43581
2040	8.98445
2045	10.48884
2050	12.42144
2055	15.34871
2060	18.41941
2065	20.66541
2070	21.99126
2075	22.91706
2080	24.13154
2085	25.73895
2090	27.5115
2095	29.02578
2100	30.0684