Year	Percent
1950	3.45552
1955	3.59158
1960	3.69443
1965	3.74085
1970	3.76793
1975	3.79869
1980	3.87302
1985	4.02376
1990	4.50675
1995	4.736
2000	4.85878
2005	4.92603
2010	5.03264
2015	5.10491
2020	5.17095
2025	5.19096
2030	5.20355
2035	5.2844
2040	5.48637
2045	5.73491
2050	6.10442
2055	6.6337
2060	7.27481
2065	7.86907
2070	8.43448
2075	9.08504
2080	9.8068
2085	10.54604
2090	11.28275
2095	12.02879
2100	12.78722