The 37 seconds result from the initial difference of 10 seconds at the start of 1972, plus 27 leap seconds in UTC since 1972.
ðə θˈɜːɾi sˈɛvən sˈɛkəndz ɹɪzˈʌlt fɹʌmðɪ ɪnˈɪʃəl dˈɪfɹəns ʌv tˈɛn sˈɛkəndz æt ðə stˈɑːɹt ʌv nˈaɪntiːnhˈʌndɹɪd sˈɛvənti tˈuː, plˈʌs twˈɛnti sˈɛvən lˈiːp sˈɛkəndz ɪn jˌuːtˌiːsˈiː sˈɪns nˈaɪntiːnhˈʌndɹɪd sˈɛvənti tˈuː.