| Value | Label | N | WN |
|---|---|---|---|
| - | 1914 | 1 | 0 |
| - | 1919 | 1 | 0 |
| - | 1922 | 1 | 0 |
| - | 1923 | 1 | 0 |
| - | 1925 | 1 | 0 |
| - | 1926 | 3 | 0 |
| - | 1927 | 2 | 0 |
| - | 1928 | 1 | 0 |
| - | 1929 | 1 | 0 |
| - | 1930 | 1 | 0 |
| - | 1931 | 3 | 0 |
| - | 1932 | 5 | 0 |
| - | 1933 | 4 | 0 |
| - | 1934 | 5 | 0 |
| - | 1935 | 8 | 0 |
| - | 1936 | 4 | 0 |
| - | 1937 | 1 | 0 |
| - | 1938 | 5 | 0 |
| - | 1940 | 3 | 0 |
| - | 1941 | 7 | 0 |
| - | 1942 | 12 | 0 |
| - | 1943 | 4 | 0 |
| - | 1944 | 2 | 0 |
| - | 1945 | 3 | 0 |
| - | 1946 | 7 | 0 |
| - | 1947 | 7 | 0 |
| - | 1948 | 7 | 0 |
| - | 1949 | 2 | 0 |
| - | 1950 | 5 | 0 |
| - | 1951 | 9 | 0 |
| - | 1952 | 6 | 0 |
| - | 1953 | 4 | 0 |
| - | 1954 | 3 | 0 |
| - | 1955 | 7 | 0 |
| - | 1956 | 10 | 0 |
| - | 1957 | 9 | 0 |
| - | 1958 | 7 | 0 |
| - | 1959 | 3 | 0 |
| - | 1960 | 10 | 0 |
| - | 1961 | 10 | 0 |
| - | 1962 | 5 | 0 |
| - | 1963 | 6 | 0 |
| - | 1964 | 9 | 0 |
| - | 1965 | 6 | 0 |
| - | 1966 | 4 | 0 |
| - | 1967 | 5 | 0 |
| - | 1968 | 2 | 0 |
| - | 1969 | 7 | 0 |
| - | 1970 | 6 | 0 |
| - | 1971 | 3 | 0 |
| - | 1972 | 1 | 0 |
| - | 1973 | 1 | 0 |
| - | 1976 | 1 | 0 |
| - | 1978 | 2 | 0 |
| - | 1979 | 4 | 0 |
| - | 1981 | 2 | 0 |
| - | 1983 | 3 | 0 |
| - | 1984 | 2 | 0 |
| - | 1987 | 1 | 0 |
| 9999 | 무응답 | 363 | 0 |
| 8888 | 비해당 | 351 | 0 |
This variable is numeric