How many times is the word (yatafakkarun — يتفكرون) mentioned in the Holy Quran?

The word "yatafakkaroon" (they ponder/reflect) is mentioned eighteen times in the Quran: twice in Surah Al-Baqarah, once in Al-An'am, twice in Al-A'raf, once in Yunus, three times in An-Nahl, twice in Ar-Rum, once in Saba', once in Az-Zumar, once in Al-Jathiyah, and once in Al-Hashr. As for Surah Al-Muddaththir, the word "fakkara" (he thought/pondered) is mentioned in it.