I want to know the answer to the following question:
How many of the richest families had a decrease in total wealth between 2007 and 2009?
All the background I'm provided with is that "The Federal Reserve surveyed 4,000 households between 2007 and 2009, and found that the total wealth of 63 percent of all Americans declined in that period.". Is that enough to answer the question?
Answer: no