Value |
Category |
1970 |
|
1973 |
|
1978 |
|
1980 |
|
1981 |
|
1982 |
|
1983 |
|
1985 |
|
1988 |
|
1990 |
|
1991 |
|
1992 |
|
1995 |
|
1996 |
|
1997 |
|
1998 |
|
1999 |
|
2001 |
|
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.