1975: Adopted self-administered method for all expenditure items (previously, only food expense was surveyed through self-administration while the rest were surveyed through interview on a quarterly basis.)
1982: Restructured 5 expenditure items to 9 expenditure items (food, housing, light and heat, furniture, clothing, healthcare, education/culture/leisure, transportation, and other expenses)
2003: The urban household survey expanded to the nationwide household survey.
2005: Introduced the multi-purpose correlation sample method
2006: Conducted the survey on single-person households; introduced the electronic housekeeping book system
2009: Changed the classification of consumption expenditure items into the classification based on COICOP
2014: Partially consolidated items (to 426 items)
2017:The Household Income and Expenditure Survey was divided into two parts; income and expenditure. -(Expenditure survey) Dedicated sample of 12,000 households including agricultural, forestry and fishery households, annual statistics -(Income survey) Existing multi-purpose sample of 5,500 households, quarterly statistics
2019: The income survey and expenditure survey were integrated into the Household Income and Expenditure Survey (based on a dedicated sample of 7,200 households per month, including agricultural, forestry and fishery households) -The quarterly income survey and annual expenditure survey were integrated into a 6-6-6 rotating sample system*. *Households selected for the sample participate in the survey for six consecutive months and then join again for another six months after a half-year break.
Data Collection Method
Items related to household status: Interview by surveyors
Items related to household income and expenditure: Self-administered questionnaires (through paper or electronic household ledgers) -Paper household ledgers: Households in the sample write their income and expenditure on a paper household ledger. Then a survey conductor reviews and enters the answers. -Electronic housekeeping ledgers: Households access online via PC or mobile devices to fill in the electronic housekeeping books.