<Table> <Tr> <Th_colspan="2"> Silk Road </Th> </Tr> <Tr> <Td_colspan="2"> Main routes of the Silk Road </Td> </Tr> <Tr> <Th_colspan="2"> Route information </Th> </Tr> <Tr> <Th> Time period </Th> <Td> Around 114 BCE--1450s CE </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th_colspan="2"> UNESCO World Heritage Site </Th> </Tr> <Tr> <Th> Official name </Th> <Td> Silk Roads: the Routes Network of Chang'an - Tianshan </Td> </Tr> <Tr> <Th> Type </Th> <Td> Cultural </Td> </Tr> <Tr> <Th> Criteria </Th> <Td> ii, iii, iv, vi </Td> </Tr> <Tr> <Th> Designated </Th> <Td> 2014 (38th session) </Td> </Tr> <Tr> <Th> Reference no . </Th> <Td> 1442 </Td> </Tr> <Tr> <Th> Region </Th> <Td> Asia - Pacific </Td> </Tr> <Tr> <Th_colspan="2"> </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Silk Road </Th> </Tr>

When was the silk road made in china