Year	Percent
1950	5.13514
1955	4.62138
1960	4.26276
1965	4.10082
1970	4.06721
1975	4.11644
1980	4.19549
1985	4.2853
1990	4.59367
1995	4.76923
2000	4.94801
2005	5.13942
2010	5.25371
2015	5.14002
2020	5.19327
2025	5.37549
2030	5.66577
2035	6.00689
2040	6.40877
2045	6.87112
2050	7.55257
2055	8.40028
2060	9.36938
2065	10.34697
2070	11.37935
2075	12.44917
2080	13.59121
2085	14.78613
2090	15.98301
2095	17.16612
2100	18.34642