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Add 8.096m to data values 1969-1994 to refer to RLR
Add 8.057m to data values for 1995 to refer to RLR
Add 8.034m to data values 1996-2000 to refer to RLR
Add 6.528m to data values 2003 onwards to refer to RLR
RLR is 8.800m below primary benchmark R 137