In what year was the first official IPA (International Phonetic Alphabet) chart published?

The IPA (International Phonetic Alphabet) chart is a listing of universal phonetic sounds, conceptualized by Otto Jespersen in a letter to the International Phonetic Association and developed by Henry Sweet, Daniel Jones, A.J. Ellis and Paul Passy in 1888.

It's purpose was to unify the representation of spoken language into a standardized form that would thereby avoid any confusion posed by inconsistent conventional spelling, tone languages and pronunciations not common across all languages.

By assigning a single symbol (mostly borrowed from Roman characters) to a single sound, the teaching and learning of languages and identification of speaking difficulties was made universally available worldwide and, whilst updated as needed throughout the 20th and 21st centuries, is still used widely by Linguists, Speech pathologists and even Singers all over the world as a primary tool in understanding speech sciences.