Year	Percent
1950	5.16192
1955	4.69537
1960	4.55957
1965	4.45055
1970	4.34355
1975	4.32191
1980	4.0892
1985	4.13457
1990	4.66732
1995	4.85099
2000	4.99051
2005	5.09375
2010	5.41449
2015	6.08033
2020	6.88581
2025	7.84327
2030	9.09173
2035	10.60105
2040	12.51116
2045	14.72773
2050	17.13878
2055	19.78267
2060	22.43944
2065	24.93755
2070	26.98048
2075	28.5298
2080	30.01287
2085	31.3985
2090	32.6184
2095	33.62039
2100	34.4353