Year	Percent
1950	8.3223
1955	8.51878
1960	9.37131
1965	9.46815
1970	8.80563
1975	8.33712
1980	7.22189
1985	6.76807
1990	7.8997
1995	7.71379
2000	7.7256
2005	7.30515
2010	6.91459
2015	7.82458
2020	9.49072
2025	11.56634
2030	13.22804
2035	14.95621
2040	16.76907
2045	19.06953
2050	21.92964
2055	24.58902
2060	26.10818
2065	26.81027
2070	28.12303
2075	29.75708
2080	31.23965
2085	32.24374
2090	32.8776
2095	33.47578
2100	34.17592