<Tr> <Td> North Dakota </Td> <Td> Secondary Enforcement </Td> <Td> July 14, 1994 </Td> <Td> Age 18 + in front seats; <P> under 18 in all seats </P> </Td> <Td> $20 for age 18 +; $25 + 1 point on license for under 18 </Td> <Td> 74.8% </Td> </Tr> <P> under 18 in all seats </P> <Tr> <Td> Ohio </Td> <Td> Secondary Enforcement </Td> <Td> May 6, 1986 </Td> <Td> Age 15 + in front seat; 8--14 in all seats </Td> <Td> $30 for driver; $20 for passenger </Td> <Td> 83.8% </Td> </Tr> <Tr> <Td> Oklahoma </Td> <Td> Primary Enforcement </Td> <Td> February 1, 1987 </Td> <Td> Age 13 + in front seats </Td> <Td> $20 </Td> <Td> 85.9% </Td> </Tr>

When did it become illegal to not wear a seatbelt