Year	Percent
1950	3.63637
1955	3.62983
1960	3.66974
1965	3.71356
1970	3.76155
1975	3.80886
1980	3.86567
1985	3.94175
1990	4.22435
1995	4.51757
2000	4.55823
2005	4.76956
2010	4.90123
2015	4.83396
2020	5.03636
2025	5.42564
2030	5.97705
2035	6.57165
2040	7.22344
2045	7.95071
2050	8.76638
2055	9.66155
2060	10.56269
2065	11.39024
2070	12.39679
2075	13.57136
2080	14.63779
2085	15.59458
2090	16.50451
2095	17.45472
2100	18.48125