<Tr> <Th_colspan="2"> Demographics </Th> </Tr> <Tr> <Th> Population </Th> <Td> 142,132 (2011) </Td> </Tr> <Tr> <Th> Pop . density </Th> <Td> 227, 6 / km (5,895 / sq mi) </Td> </Tr> <Tr> <Th> Ethnic groups </Th> <Td> Spanish, other minority groups </Td> </Tr>

When was the last volcanic eruption on lanzarote