As of the 2010 census, the population of Tallahassee was estimated to be 181,376. There were 74,815 households, 21.3% of which had children under 18 living in them. 27.7% were married couples living together, 14.4% had a female householder with no husband, and 53.7% were non-families. 34.1% of all households were made up of individuals living alone and 6.7% had someone living alone who was 65 years of age or older. The average household size was 2.23 and the average family size was 2.88. Children under the age of 5 were 5.5% of the population, persons under 18 were 17.2%, and persons 65 years or older were 8.1%. The median age was 26 years. For every 100 females, there were 89.5 males. For every 100 females age 18 and over, there were 86.7 males. 57.4% of the population was White, 35.0% Black, 3.7% Asian, 0.2% American Indian and Alaska Native, 0.1% Native Hawaiian and Other Pacific Islander, 1.3% some other race, and 2.3% two or more races. 6.3% were Hispanic or Latino of any race, and 53.3% were non-Hispanic White. For the period 2009–2013, the estimated median household income was $39,524, and the per capita income was $23,778. The number of persons below the poverty level was estimated at 30.2%.
Question: How many years was the estimated median household income for $39,524?
Answer: 4