The S&P/Case-Shiner Index summarizes changes in housing values across 20 large metropolitan areas. Examine the most recent data and determine to what extent housing values have changed in the different markets during the past 12 months. Determine to what extent housing values increased in the same markets on an annual basis from 2001 through 2006. Describe the relationship between the change in housing values before 2007 and the change after 2007.