<Table> Agriculture productivity in India, growth in average yields from 1970 to 2010 <Tr> <Th> Crop </Th> <Th> Average YIELD, 1970 - 1971 </Th> <Th> Average YIELD, 1990 - 1991 </Th> <Th> Average YIELD, 2010--2011 </Th> </Tr> <Tr> <Td> </Td> <Td> kilogram per hectare </Td> <Td> kilogram per hectare </Td> <Td> kilogram per hectare </Td> </Tr> <Tr> <Td> Rice </Td> <Td> 1123 </Td> <Td> 1740 </Td> <Td> 2240 </Td> </Tr> <Tr> <Td> Wheat </Td> <Td> 1307 </Td> <Td> 2281 </Td> <Td> 2938 </Td> </Tr> <Tr> <Td> Pulses </Td> <Td> 524 </Td> <Td> 578 </Td> <Td> 689 </Td> </Tr> <Tr> <Td> Oilseeds </Td> <Td> 579 </Td> <Td> 771 </Td> <Td> 1325 </Td> </Tr> <Tr> <Td> Sugarcane </Td> <Td> 48322 </Td> <Td> 65395 </Td> <Td> 68596 </Td> </Tr> <Tr> <Td> Tea </Td> <Td> 1182 </Td> <Td> 1652 </Td> <Td> 1669 </Td> </Tr> <Tr> <Td> Cotton </Td> <Td> 106 </Td> <Td> 225 </Td> <Td> 510 </Td> </Tr> </Table> <Tr> <Th> Crop </Th> <Th> Average YIELD, 1970 - 1971 </Th> <Th> Average YIELD, 1990 - 1991 </Th> <Th> Average YIELD, 2010--2011 </Th> </Tr> <Tr> <Td> </Td> <Td> kilogram per hectare </Td> <Td> kilogram per hectare </Td> <Td> kilogram per hectare </Td> </Tr> <Tr> <Td> Rice </Td> <Td> 1123 </Td> <Td> 1740 </Td> <Td> 2240 </Td> </Tr>

Describe the contribution of agriculture to the indian economy