Definition
Education in single years. This variable is constructed from the educational level (V106) and the grade at that level (V107) as follows:
V106 = > V133
0 = > 0
1 = > V107
2 = > V107+x
3 = > V107+y
9 = > 99
x = years to complete primary education
y = years to complete primary and secondary education
where both x and y are country-specific.