It is published every month by the Turkish Statistical Institute: data.tuik.gov.tr/Search/Search?text=TÜFE.
You can see historical data in a convenient table on the website of
the Central Bank of Turkey: tcmb.gov.tr/wps/wcm/connect/TR/TCMB+TR/Main+Menu/Istatistikler/Enflasyon+Verileri/Tuketici+Fiyatlari
en.wikipedia.org/wiki/Consumer_price_index