Average Effective Federal Funds Rates in the post-war by decades

1955-1960  2.62%
1961-1970  4.58%
1971-1980  7.72%
1981-1990  9.44%
1991-2000  4.96%
2001-2010  2.35%
2011-2013  0.12%
2014 to date .09%

Post-war average (six decades): 5.3%