The U.S. Bureau of Labor Statistics collects data on unemployment rates in each state. The data contained in the file UnemploymentRates show the unemployment rate for every state and the District of Columbia over two consecutive years. To compare unemployment rates for the previous year with unemployment rates for the current year, compute the first quartile, the median, and the third quartile for the previous year unemployment data and the current year unemployment data. What do these statistics suggest about the change in unemployment rates across the states over these two years?