Add 5.569m to data values 1971-1972 to refer to RLR<br>Add 5.956m to data values 1973-1978 to refer to RLR<br>Add 5.894m to data values 1979-1997 to refer to RLR<br>Add 5.681m to data values 2000-2002 to refer to RLR<br>Add 5.881m to data values 2003 onwards to refer to RLR<br>RLR is 10.600m below primary benchmark TGBM