Year	Percent
1950	5.88276
1955	5.41297
1960	5.0612
1965	4.76651
1970	4.58916
1975	4.46592
1980	4.18909
1985	3.89485
1990	3.87521
1995	4.58302
2000	4.32418
2005	4.23579
2010	4.38196
2015	4.50643
2020	4.69412
2025	4.94679
2030	5.21914
2035	5.65061
2040	6.6615
2045	8.06668
2050	9.84999
2055	11.83761
2060	13.4348
2065	14.93089
2070	16.56806
2075	18.43103
2080	20.30704
2085	22.09343
2090	23.76092
2095	25.32411
2100	26.77436