Chart 2: We might have produced a whole lot more than reported

Annual aggregates production, millions of tonnes

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No data was produced in 1997. Estimates corrected for underreporting upweights the published aggregates production to correct for response rates of less than 100%. No adjustment is made for before 2012, as response rates are not available and less information about the survey at that time is available too.

Chart: Brad Olsen/InfometricsSource: Infometrics, NZP&MCreated with Datawrapper