Variable | Year | Supplement |
---|---|---|
TRAVEL | 2018 | Sample adult questionnaire |
TRAVEL | 2017 | Sample adult questionnaire |
TRAVEL | 2016 | Sample adult questionnaire |
TRAVEL | 2015 | Sample adult questionnaire |
TRAVEL | 2014 | Sample adult questionnaire |
TRAVEL | 2013 | Sample adult questionnaire |
TRAVEL | 2012 | Sample adult questionnaire |
TRAVEL | 2011 | Sample adult questionnaire |
TRAVEL | 2010 | Sample adult questionnaire |
TRAVEL | 2009 | Sample adult questionnaire |
TRAVEL | 2008 | Sample adult questionnaire |
TRAVEL_A | 2021 | Sample adult questionnaire |