Year	Percent
1950	4.46002
1955	4.19668
1960	3.94733
1965	3.81724
1970	3.50836
1975	3.44352
1980	3.57544
1985	3.44515
1990	3.76192
1995	4.33261
2000	4.11493
2005	4.04868
2010	3.97651
2015	3.69093
2020	3.44309
2025	3.37335
2030	3.57314
2035	4.08984
2040	4.89068
2045	5.84493
2050	7.05204
2055	8.28564
2060	9.5385
2065	10.81931
2070	12.27614
2075	13.56511
2080	14.91919
2085	16.31442
2090	17.72176
2095	19.09943
2100	20.45254