Find and plot data since 1960 on the net worth as a percentage of disposable personal income of households and nonprofit organizations. In which periods was net wealth as a percentage of income generally rising? In what periods was it falling? By what percentage did it decline during the Great Recession from the fourth quarter of 2007 to the second quarter of 2009? (Note that net wealth data for nonprofit organizations is included with that of households for technical reasons but the net wealth of households is far larger than that of nonprofit organizations, so the data series mainly relates to households.)