From its beginning in 1961 through December 1971, the adjustments were made regularly in fractional leap seconds so that UTC approximated UT2.
fɹʌm ɪts bɪɡˈɪnɪŋ ɪn nˈaɪntiːnhˈʌndɹɪd sˈɪksti wˈʌn θɹuː dᵻsˈɛmbɚ nˈaɪntiːnhˈʌndɹɪd sˈɛvənti wˈʌn, ðɪ ɐdʒˈʌstmənts wɜː mˌeɪd ɹˈɛɡjʊlɚli ɪn fɹˈækʃənəl lˈiːp sˈɛkəndz sˌoʊ ðæt jˌuːtˌiːsˈiː ɐpɹˈɑːksɪmˌeɪɾᵻd jˌuːtˈiː tˈuː.