Year	Percent
1950	5.24244
1955	4.75755
1960	4.41647
1965	4.28758
1970	4.39484
1975	4.48193
1980	4.47096
1985	4.33054
1990	4.40873
1995	4.30526
2000	4.26897
2005	4.19854
2010	4.1231
2015	4.3434
2020	4.73381
2025	5.17273
2030	5.61843
2035	6.09672
2040	6.69845
2045	7.52409
2050	8.42633
2055	9.24519
2060	10.00758
2065	10.78903
2070	11.68395
2075	12.69927
2080	13.66859
2085	14.56345
2090	15.40849
2095	16.25064
2100	17.12625