Add 0.089m to data values 1986-1989 to refer to RLR<br>Add 0.089m to data values 1990-1991 to refer to RLR<br>Add 0.089m to data values for 1991 to refer to RLR<br>Add 0.089m to data values for 1992 to refer to RLR<br>Add 0.089m to data values for 1992 to refer to RLR<br>Add 0.089m to data values 1992-2000 to refer to RLR<br>RLR is 15.800m below primary benchmark ST 5057 7881