<Tr> <Td> Vermont </Td> <Td> Secondary Enforcement </Td> <Td> January 1, 1994 </Td> <Td> All ages in all seats </Td> <Td> $25 </Td> <Td> 85.2% </Td> </Tr> <Tr> <Td> Virginia </Td> <Td> Secondary Enforcement </Td> <Td> January 1, 1988 </Td> <Td> All drivers; age 18 + in front seats; under 18 in all seats </Td> <Td> $25 </Td> <Td> 80.5% </Td> </Tr> <Tr> <Td> Washington </Td> <Td> Primary Enforcement </Td> <Td> June 11, 1986 </Td> <Td> Age 8 + in all seats </Td> <Td> $124 </Td> <Td> 97.6% </Td> </Tr> <Tr> <Td> West Virginia </Td> <Td> Primary Enforcement </Td> <Td> September 1, 1993 </Td> <Td> All ages in front seats; 8--17 in rear seats </Td> <Td> $25 </Td> <Td> 82.1% </Td> </Tr>

When did it become mandatory to wear seat belts