NDV2 |
1996 |
Person (core questionnaire) |
NDV2 |
1993 |
Person (core questionnaire) |
NDV2 |
1992 |
Person (core questionnaire) |
NDV2 |
1991 |
Person (core questionnaire) |
NDV2 |
1990 |
Person (core questionnaire) |
NDV2 |
1989 |
Person (core questionnaire) |
NDV2 |
1988 |
Person (core questionnaire) |
NDV2 |
1987 |
Person (core questionnaire) |
NDV2 |
1986 |
Person (core questionnaire) |
NDV2 |
1985 |
Person (core questionnaire) |
NDV2 |
1984 |
Person (core questionnaire) |
NDV2 |
1983 |
Person (core questionnaire) |
NDV2 |
1982 |
Person (core questionnaire) |
NDV2 |
1981 |
Person (core questionnaire) |
NDV2 |
1980 |
Person (core questionnaire) |
NDV2 |
1979 |
Person (core questionnaire) |