Year	Percent
1950	6.77729
1955	7.18016
1960	7.43018
1965	7.6075
1970	7.77177
1975	7.9081
1980	8.18598
1985	8.49813
1990	10.43535
1995	11.13559
2000	11.95684
2005	13.24962
2010	14.68553
2015	16.78272
2020	19.13177
2025	21.68044
2030	24.28197
2035	26.44497
2040	28.25685
2045	30.16924
2050	32.35844
2055	34.22654
2060	35.60954
2065	36.62102
2070	37.5395
2075	38.22452
2080	38.797
2085	39.24776
2090	39.58648
2095	39.85766
2100	40.10498