Add 7.134m to data values 1832-1927 to refer to RLR<br>Add 4.391m to data values 1951-1952 to refer to RLR<br>Add 4.079m to data values 1968-1975 to refer to RLR<br>Add 4.070m to data values 1976-1983 to refer to RLR<br>Add 1.550m to data values 1984-1986 to refer to RLR<br>Add 4.068m to data values 1987 onwards to refer to RLR<br>RLR is 11.600m below primary benchmark TQ 9080 7549