Add 4.868m to data values 1964-1985 to refer to RLR<br>Add 4.868m to data values 1985-1986 to refer to RLR<br>Add 4.868m to data values for 1987 to refer to RLR<br>Add 4.868m to data values 1987-1990 to refer to RLR<br>Add 4.868m to data values for 1990 to refer to RLR<br>Add 4.868m to data values 1990-1991 to refer to RLR<br>Add 4.868m to data values for 1991 to refer to RLR<br>Add 4.868m to data values for 1991 to refer to RLR<br>Add 4.868m to data values 1991-1992 to refer to RLR<br>Add 4.868m to data values for 1992 to refer to RLR<br>Add 4.868m to data values for 1992 to refer to RLR<br>Add 4.868m to data values for 1993 to refer to RLR<br>Add 4.868m to data values for 1993 to refer to RLR<br>Add 4.868m to data values for 1994 to refer to RLR<br>Add 4.868m to data values for 1994 to refer to RLR<br>Add 4.868m to data values for 1995 to refer to RLR<br>Add 4.868m to data values 1995 onwards to refer to RLR<br>RLR is 12.200m below primary benchmark N-402-BIS