Year	Percent
1950	4.8942
1955	4.49186
1960	4.20282
1965	4.02856
1970	3.96798
1975	3.99727
1980	4.0787
1985	4.18335
1990	4.59517
1995	5.12724
2000	5.43124
2005	5.4502
2010	5.52518
2015	5.32974
2020	5.20182
2025	5.14509
2030	5.19727
2035	5.50894
2040	6.43442
2045	7.96604
2050	9.53565
2055	10.64262
2060	11.6843
2065	13.22261
2070	15.07462
2075	16.78271
2080	18.35062
2085	19.83258
2090	21.32729
2095	22.89366
2100	24.4856