Year	Percent
1950	5.50474
1955	5.31971
1960	5.27256
1965	5.15783
1970	5.08647
1975	5.0188
1980	4.95762
1985	4.98321
1990	5.16139
1995	5.10184
2000	5.00464
2005	4.87391
2010	4.79388
2015	4.74368
2020	4.79446
2025	4.90707
2030	5.07938
2035	5.39907
2040	5.84744
2045	6.32745
2050	6.77508
2055	7.23377
2060	7.84459
2065	8.6802
2070	9.6915
2075	10.84342
2080	12.02376
2085	13.26566
2090	14.57523
2095	15.94022
2100	17.3448