<P> In 2016, measured by the MasterCard Global Cities Destination Index, Paris was the third busiest airline destination in the world, with 18.03 million visitors, behind Bangkok (21.47 million) and London (19.88 million). According to the Paris Convention and Visitors Bureau, 393,008 workers in Greater Paris, or 12.4 percent of the total workforce, are engaged in tourism - related sectors such as hotels, catering, transport, and leisure . </P> <Table> Paris <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th_colspan="2"> UNESCO World Heritage Site </Th> </Tr> <Tr> <Th> Official name </Th> <Td> Paris, Banks of the Seine </Td> </Tr> <Tr> <Th> Location </Th> <Td> Île - de-France, Seine, Kingdom of France, France </Td> </Tr> <Tr> <Th> Coordinates </Th> <Td> 48 ° 51 ′ 24" N 2 ° 21 ′ 07" E ﻿ / ﻿ 48.856578 ° N 2.351828 ° E ﻿ / 48.856578; 2.351828 </Td> </Tr> <Tr> <Th> Area </Th> <Td> 105.4 km (1.135 × 10 sq ft) </Td> </Tr> <Tr> <Th> Criteria </Th> <Td> i, ii, iv </Td> </Tr> <Tr> <Th> Reference </Th> <Td> 600 </Td> </Tr> <Tr> <Th> Inscription </Th> <Td> 1991 (15th Session) </Td> </Tr> <Tr> <Th> Website </Th> <Td> www.paris.fr </Td> </Tr> <Tr> <Td_colspan="2"> Location of Paris </Td> </Tr> <Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr> </Table> <Tr> <Th_colspan="2"> UNESCO World Heritage Site </Th> </Tr> <Tr> <Th> Official name </Th> <Td> Paris, Banks of the Seine </Td> </Tr>

When did paris become the city of light