Year	Percent
1950	6.621
1955	6.93077
1960	7.11328
1965	7.46707
1970	7.40101
1975	6.94834
1980	7.02367
1985	7.06595
1990	8.15969
1995	8.48699
2000	8.63967
2005	8.63435
2010	8.87626
2015	10.28176
2020	12.52068
2025	14.99781
2030	17.5188
2035	20.17307
2040	22.77907
2045	25.49586
2050	28.2898
2055	30.76778
2060	31.51915
2065	31.82981
2070	32.47833
2075	33.39529
2080	34.16626
2085	34.84985
2090	35.16689
2095	35.26599
2100	35.48101