The U.S. Census Bureaus 2007–2011 American Community Survey indicated the median household income for Indianapolis city was $42,704, and the median family income was $53,161. Median income for males working full-time, year-round, was $42,101, compared to $34,788 for females. Per capita income for the city was $24,430, 14.7% of families and 18.9% of the citys total population living below the poverty line (28.3% were under the age of 18 and 9.2% were age 65 or older).
Question: How many years was the time span of the American Community Survey?
Answer: 4