Year	Percent
1950	4.6946
1955	3.7935
1960	3.48164
1965	3.58005
1970	3.74634
1975	4.00725
1980	2.85481
1985	2.76174
1990	2.91601
1995	3.22633
2000	3.59876
2005	3.96073
2010	4.77308
2015	5.04264
2020	5.26422
2025	5.51585
2030	5.93409
2035	6.41174
2040	5.7846
2045	5.97857
2050	6.15683
2055	6.81175
2060	8.50589
2065	9.84263
2070	11.47888
2075	13.21159
2080	14.86294
2085	16.60477
2090	18.43182
2095	20.26908
2100	22.05565