Share of wealth held by Top 1% in the United States, 1922-1998.
Source: 1922-1989 data from Edward N. Wolff, Top Heavy (New Press: 1996). 1992-1998 data from Edward N. Wolff, "Recent Trends in Wealth Ownership, 1983-98," Jerome Levy Economics Institute, April 2000.
http://sociology.ucsc.edu/whorulesamerica/power/wealth.html