Union membership and share of income going to the top 10 percent, 1917–2015
| Year | Union membership | Share of income going to the top 10 percent |
|---|---|---|
| 1917 | 11.0% | 40.3% |
| 1918 | 12.1% | 39.9% |
| 1919 | 14.3% | 39.5% |
| 1920 | 17.5% | 38.1% |
| 1921 | 17.6% | 42.9% |
| 1922 | 14.0% | 42.9% |
| 1923 | 11.7% | 40.6% |
| 1924 | 11.3% | 43.3% |
| 1925 | 11.0% | 44.2% |
| 1926 | 10.7% | 44.1% |
| 1927 | 10.6% | 44.7% |
| 1928 | 10.4% | 46.1% |
| 1929 | 10.1% | 43.8% |
| 1930 | 10.7% | 43.1% |
| 1931 | 11.2% | 44.4% |
| 1932 | 11.3% | 46.3% |
| 1933 | 9.5% | 45.0% |
| 1934 | 9.8% | 45.2% |
| 1935 | 10.8% | 43.4% |
| 1936 | 11.1% | 44.8% |
| 1937 | 18.6% | 43.3% |
| 1938 | 23.9% | 43.0% |
| 1939 | 24.8% | 44.6% |
| 1940 | 23.5% | 44.4% |
| 1941 | 25.4% | 41.0% |
| 1942 | 24.2% | 35.5% |
| 1943 | 30.1% | 32.7% |
| 1944 | 32.5% | 31.5% |
| 1945 | 33.4% | 32.6% |
| 1946 | 31.9% | 34.6% |
| 1947 | 31.1% | 33.0% |
| 1948 | 30.5% | 33.7% |
| 1949 | 29.6% | 33.8% |
| 1950 | 30.0% | 33.9% |
| 1951 | 32.4% | 32.8% |
| 1952 | 31.5% | 32.1% |
| 1953 | 33.2% | 31.4% |
| 1954 | 32.7% | 32.1% |
| 1955 | 32.9% | 31.8% |
| 1956 | 33.2% | 31.8% |
| 1957 | 32.0% | 31.7% |
| 1958 | 31.1% | 32.1% |
| 1959 | 31.6% | 32.0% |
| 1960 | 30.7% | 31.7% |
| 1961 | 28.7% | 31.9% |
| 1962 | 29.1% | 32.0% |
| 1963 | 28.5% | 32.0% |
| 1964 | 28.5% | 31.6% |
| 1965 | 28.6% | 31.5% |
| 1966 | 28.7% | 32.0% |
| 1967 | 28.6% | 32.0% |
| 1968 | 28.7% | 32.0% |
| 1969 | 28.3% | 31.8% |
| 1970 | 27.9% | 31.5% |
| 1971 | 27.4% | 31.8% |
| 1972 | 27.5% | 31.6% |
| 1973 | 27.1% | 31.9% |
| 1974 | 26.5% | 32.4% |
| 1975 | 25.7% | 32.6% |
| 1976 | 25.7% | 32.4% |
| 1977 | 25.2% | 32.4% |
| 1978 | 24.7% | 32.4% |
| 1979 | 25.4% | 32.3% |
| 1980 | 23.6% | 32.9% |
| 1981 | 22.3% | 32.7% |
| 1982 | 21.6% | 33.2% |
| 1983 | 21.4% | 33.7% |
| 1984 | 20.5% | 33.9% |
| 1985 | 19.0% | 34.3% |
| 1986 | 18.5% | 34.6% |
| 1987 | 17.9% | 36.5% |
| 1988 | 17.6% | 38.6% |
| 1989 | 17.2% | 38.5% |
| 1990 | 16.7% | 38.8% |
| 1991 | 16.2% | 38.4% |
| 1992 | 16.2% | 39.8% |
| 1993 | 16.2% | 39.5% |
| 1994 | 16.1% | 39.6% |
| 1995 | 15.3% | 40.5% |
| 1996 | 14.9% | 41.2% |
| 1997 | 14.7% | 41.7% |
| 1998 | 14.2% | 42.1% |
| 1999 | 13.9% | 42.7% |
| 2000 | 13.5% | 43.1% |
| 2001 | 13.5% | 42.2% |
| 2002 | 13.3% | 42.4% |
| 2003 | 12.9% | 42.8% |
| 2004 | 12.5% | 43.6% |
| 2005 | 12.5% | 44.9% |
| 2006 | 12.0% | 45.5% |
| 2007 | 12.1% | 45.7% |
| 2008 | 12.4% | 46.0% |
| 2009 | 12.3% | 45.5% |
| 2010 | 11.9% | 46.4% |
| 2011 | 11.8% | 46.6% |
| 2012 | 11.2% | 47.8% |
| 2013 | 11.2% | 46.7% |
| 2014 | 11.1% | 47.3% |
| 2015 | 11.1% | 47.8% |
Sources: Data on union density follows the composite series found in Historical Statistics of the United States; updated to 2015 from unionstats.com. Income inequality (share of income to top 10 percent) data are from Thomas Piketty and Emmanuel Saez, “Income Inequality in the United States, 1913–1998,” Quarterly Journal of Economics vol. 118, no. 1 (2003) and updated data from the Top Income Database, updated June 2016.