<Tr> <Td> Total </Td> <Td> 2,909.5 </Td> <Td> 100% </Td> </Tr> <P> (under construction) </P> <P> (under construction) </P> <Table> <Tr> <Th> Revenue by Source </Th> <Th> $thousands </Th> <Th> Percent of revenue </Th> </Tr> </Table>

What is the main source of revenue for counties