Year	Percent
1950	3.53141
1955	3.44797
1960	3.52989
1965	3.6696
1970	3.92106
1975	4.29112
1980	4.65247
1985	4.95296
1990	5.67897
1995	6.01961
2000	6.59668
2005	7.35825
2010	8.26477
2015	9.38712
2020	10.91432
2025	12.92607
2030	14.77088
2035	16.27468
2040	17.93758
2045	19.71946
2050	21.71173
2055	23.51177
2060	25.144
2065	26.74792
2070	28.35181
2075	29.895
2080	31.28874
2085	32.50536
2090	33.57213
2095	34.49354
2100	35.28684