Year	Percent
1950	4.59375
1955	4.26274
1960	4.05826
1965	4.18586
1970	4.30289
1975	4.35759
1980	4.76038
1985	4.58743
1990	4.87808
1995	4.94947
2000	4.79451
2005	4.85148
2010	5.11283
2015	5.22819
2020	5.41192
2025	5.60564
2030	6.02009
2035	6.65197
2040	7.42684
2045	8.57683
2050	9.8986
2055	11.67855
2060	13.84791
2065	16.01909
2070	17.9848
2075	19.94777
2080	21.87664
2085	23.73491
2090	25.46805
2095	27.07996
2100	28.56977