First-time homebuyers accounted for half of all home sales from July 2009 through June 2010, according to a National Association of Realtors survey of buyers and sellers. That's the highest share of first-time-buyer purchases in the history of the survey, which dates back to 1981. First-time buyers responding to the survey made up 47 percent of sales in 2009. The 2010 NAR Profile of Home Buyers and Sellers, based on 8,449 responses to a survey sent to homebuyers and sellers nationwide whose transactions took place between July 2009 and June 2010, according to county records. The vast majority of first-timers (93 percent) participating in the survey, and almost three-quarters of all buyers (71 percent) responding to the survey participated in a federal homebuyer tax credit program.The t...