| Value | Label | N | WN |
|---|---|---|---|
| - | 1925 | 1 | 0 |
| - | 1927 | 1 | 0 |
| - | 1946 | 2 | 0 |
| - | 1955 | 1 | 0 |
| - | 1960 | 2 | 0 |
| - | 1971 | 2 | 0 |
| - | 1973 | 1 | 0 |
| - | 1974 | 1 | 0 |
| - | 1977 | 1 | 0 |
| - | 1978 | 2 | 0 |
| - | 1979 | 1 | 0 |
| - | 1980 | 4 | 0 |
| - | 1981 | 1 | 0 |
| - | 1982 | 4 | 0 |
| - | 1983 | 2 | 0 |
| - | 1984 | 4 | 0 |
| - | 1985 | 3 | 0 |
| - | 1986 | 7 | 0 |
| - | 1987 | 2 | 0 |
| - | 1988 | 8 | 0 |
| - | 1989 | 2 | 0 |
| - | 1990 | 4 | 0 |
| - | 1991 | 5 | 0 |
| - | 1992 | 4 | 0 |
| - | 1993 | 2 | 0 |
| - | 1994 | 7 | 0 |
| - | 1995 | 3 | 0 |
| - | 1997 | 4 | 0 |
| - | 1998 | 2 | 0 |
| - | 1999 | 2 | 0 |
| - | 2000 | 2 | 0 |
| - | 2002 | 2 | 0 |
| - | 2003 | 1 | 0 |
| - | 2004 | 1 | 0 |
| - | 2005 | 1 | 0 |
| 9999 | 무응답 | 175 | 0 |
| 8888 | 비해당 | 702 | 0 |
This variable is numeric