Year	Percent
1950	5.32447
1955	5.17701
1960	4.93271
1965	4.77515
1970	4.67974
1975	4.56974
1980	4.49503
1985	4.45826
1990	4.85829
1995	5.00179
2000	5.06839
2005	5.16685
2010	5.39875
2015	5.69134
2020	6.03541
2025	6.41951
2030	6.87359
2035	7.341
2040	7.88759
2045	8.48251
2050	9.07203
2055	9.92726
2060	11.00177
2065	12.17903
2070	13.34773
2075	14.44981
2080	15.5209
2085	16.60891
2090	17.74865
2095	18.9267
2100	20.09629