To overexplain - we publish estimates of photovoltaic installation for 147 countries, plus a buffer, by segment (residential / commercial / utility scale) every year to 2035.
However we update the historicals with official data where we believe this is accurate, and with new estimates when we have what we believe is a better source. Often official data for years ago is restated, and it's much less complicated to simply update our numbers with the new-best-number than to do anything else.
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