Year	Percent
1950	4.13975
1955	4.15949
1960	4.06314
1965	3.91001
1970	3.83355
1975	4.06241
1980	4.90339
1985	4.75875
1990	4.41331
1995	3.59787
2000	3.66895
2005	3.69269
2010	3.93667
2015	5.01328
2020	6.59611
2025	8.11899
2030	9.59633
2035	11.19202
2040	13.08758
2045	15.06775
2050	16.86064
2055	18.3144
2060	19.41445
2065	20.41797
2070	21.42995
2075	22.8111
2080	24.16099
2085	25.48533
2090	26.71303
2095	27.8111
2100	28.80467