<Tr> <Td> 8th </Td> <Td> 89--96 </Td> <Td> 8 </Td> </Tr> <Tr> <Td> 9th </Td> <Td> 97--130 </Td> <Td> 34 </Td> </Tr> <Tr> <Td> 10th </Td> <Td> 131--138 </Td> <Td> 8 </Td> </Tr> <Tr> <Td> 11th </Td> <Td> 139--151 </Td> <Td> 13 </Td> </Tr>

When did the dark period of nursing occur