Year	Percent
1950	4.62751
1955	4.22319
1960	4.07761
1965	4.05564
1970	4.11308
1975	4.23935
1980	4.40705
1985	4.57288
1990	4.85693
1995	4.91646
2000	5.01979
2005	4.90333
2010	4.76122
2015	4.83232
2020	5.01611
2025	5.28575
2030	5.65083
2035	6.15427
2040	6.77141
2045	7.50472
2050	8.22316
2055	8.94517
2060	9.94245
2065	11.16441
2070	12.43579
2075	13.68237
2080	14.95813
2085	16.28212
2090	17.64933
2095	19.04485
2100	20.45829