Value | Category |
---|---|
1 | less than one year |
2 | one year to less than 3 years |
3 | three years to less than 5 years |
4 | five years to less than 10 years5. |
5 | ten years to less than 20 years |
6 | twenty years to less than 30 years |
7 | thirty or more years |
9 | not stated |