In October 2012, the average house price in the United States was $219,600. In October 2003, the average price was $280,300. Required: What was the annual change in the average selling price? (Round your answer as directed, but do not use rounded numbers in intermediate calculations. Negative amount should be indicated by a minus sign. Enter your answer as a percent rounded to 2 decimal places (e.g., 32.16).) Rate of return=