<Tr> <Td> </Td> <Td> Crop </Td> <Td> 1949 Output (tons) </Td> <Td> 1978 Output (tons) </Td> <Td> 1999 Output (tons) </Td> </Tr> <Tr> <Td> 1 . </Td> <Td> Grain </Td> <Td> 113,180,000 </Td> <Td> 304,770,000 </Td> <Td> 508,390,000 </Td> </Tr> <Tr> <Td> 2 . </Td> <Td> Cotton </Td> <Td> 444,000 </Td> <Td> 2,167,000 </Td> <Td> 3,831,000 </Td> </Tr> <Tr> <Td> 3 . </Td> <Td> Oil - bearing crops </Td> <Td> 2,564,000 </Td> <Td> 5,218,000 </Td> <Td> 26,012,000 </Td> </Tr>

Which of these martial arts has been used in china for nearly 1 000 years