Questionnaire for Main Respondents in the First Wave of Survey (RI/ RCI Questionnaire)
| RI1999 | RI2000 | RI2003 | RCI2004 | RCI2005 |
| RCI2007 | RCI2009 | RCI2011 | RCI2014 | RI2016 (RCI2016) |
| RCI2018 | RCI2020 | RCI2022 | RCI2024 |
Main Respondents follow-up questionnaire (Questionnaire RR)
| RII2000 | RII2001 | RIII2001 | RIII&RIV2002 | RIV&RV2003 |
| RII&RV&RVI2004 | RR2005 | RR2006 | RR2007 | RR2008 |
| RR2009 | RR2010 | RR2011 | RR2012 | RR2014 |
| RR2016 | RR2018 | RR2020 | RR2022 | RR2024 |
Variable Naming and Coding Convention