The Texas state budget is prepared every two years and provides funding for dozens of state agencies and programs. It totals over $182 billion for 2010-2011. The majority of state revenue comes from sales tax, with other sources including business taxes, motor fuel taxes, and federal funds. Most state spending goes towards education, health and human services programs. Public education in Texas is required by the state constitution and funded through a combination of state, federal and local property taxes, with the number of students enrolled increasing over time. It is important for citizens to understand the state budget and education funding sources to know how tax dollars are used.