Value |
Category |
98 |
ns/nr |
1973 |
|
1975 |
|
1976 |
|
1977 |
|
1978 |
|
1979 |
|
1980 |
|
1981 |
|
1982 |
|
1983 |
|
1984 |
|
1985 |
|
1986 |
|
1987 |
|
Sysmiss |
|
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.