The list of housing markets continued to show improvement, according to a measurement by the National Association of Home Builders (NAHB), which expanded its “Improving Markets Index” to nearly 100 metro regions in February 2012. A total of 29 markets were added, bringing the total to 98 entries on the National Association of Home Builders/First American Improving Markets Index (IMI). Thirty-six states are now represented by at least one market on the list.