Analyze the graph below and answer the question that follows. A bar graph titled U S Wealth Distribution by Household. The x-axis is labeled 1983, 1989, 1992, 1995, 1998, 2001, and 2004. The y-axis is labeled from negative 20 percent to 100 percent. A legend notes the top bar is the Top 20 percent. The second bar is the second 20 percent. The middle bar is the third 20 percent. The very bottom bar is the Bottom 40 percent.
Data from the Levy Economics Institute

Based on the graph above, what conclusions can we draw about the distribution of wealth in the US population between 1983 and 2004?