Year	Percent
1950	5.1583
1955	4.72544
1960	4.50212
1965	4.40208
1970	4.55943
1975	4.65204
1980	4.57179
1985	4.50388
1990	4.72886
1995	4.8724
2000	5.11409
2005	5.44892
2010	6.52437
2015	7.28062
2020	8.22916
2025	9.22483
2030	10.25493
2035	11.17318
2040	12.12053
2045	13.05025
2050	14.1562
2055	15.61678
2060	17.04731
2065	18.32948
2070	19.60996
2075	20.93539
2080	22.26937
2085	23.58068
2090	24.86825
2095	26.12859
2100	27.3402