Educational services, health care and social assistance, which accounted for 18%, and Professional, scientific, and management, and administrative and waste management services, which accounted for 13% of the population. Traveling to Work: 79% of Miami area workers drove to work alone in 2005, 10% carpooled, 4% took public transportation, and 4% used other means. The remaining 3% worked at home. Among those who commuted to work, it took them on average 28.5 minutes to get to work. Poverty and Participation in Government Programs: In 2005, 14% of people were in poverty. 19% of related children under 18 were below the poverty level , compared with 14% of people 65 years old and over. 11% of all families, and 26% of families with a female householder and no husband present had incomes below the poverty level. Housing characteristics: As of 2005, the Miami area had a total of 2.3 million housing units, 13% of which were vacant. Of the total housing units, 52% were in single-unit structures, 45% were in multi-unit structures, and 3% were mobile homes. 25% of the housing units were built since 1990. Property tax increase: In March 2009, Miami area lawmakers passed a 5–10% hike in property tax millage rates throughout the metropolitan area to fund the construction of new schools and to fund understaffed schools and educational institutions, resulting in an increase in residents' property tax bills beginning in the 2009 tax year. In Florida, each county is also a school district . Each district is