Question: The king during  the 166th year of the Rattanakosin Kingdom of Thailand served for how many years and days?
Sentence (from "Bhumibol Adulyadej"): Reigning since 9 June 1946 he was, at the time of his death, the world's longest-serving head of state, the longest-reigning monarch in Thai history and the longest-serving monarch having reigned only as an adult, serving for 70 years, 126 days.
Relevant evidence: Yes