Year	Percent
1950	5.08761
1955	4.66537
1960	4.16448
1965	4.27089
1970	4.49299
1975	4.55341
1980	4.59872
1985	4.11256
1990	3.94103
1995	3.96217
2000	3.81926
2005	3.77893
2010	3.49367
2015	3.60616
2020	3.88757
2025	4.30305
2030	4.81356
2035	5.18269
2040	5.80532
2045	6.42453
2050	7.01008
2055	7.69613
2060	8.59023
2065	9.6958
2070	10.97047
2075	12.39913
2080	13.87484
2085	15.36585
2090	16.85304
2095	18.32898
2100	19.75721