Year	Percent
1950	4.87679
1955	4.53134
1960	4.41268
1965	4.38169
1970	4.3835
1975	4.40441
1980	4.42702
1985	4.43993
1990	4.74685
1995	4.74872
2000	4.73001
2005	4.72757
2010	4.71974
2015	4.66083
2020	4.67832
2025	4.78143
2030	4.95878
2035	5.19782
2040	5.50874
2045	5.91482
2050	6.41789
2055	7.04087
2060	7.79235
2065	8.76647
2070	9.99213
2075	11.41036
2080	12.91319
2085	14.47897
2090	16.11841
2095	17.81309
2100	19.52656