<prompt> Translate the following text to EnglishUhakika wa ratiba na mzunguko wa mgomo ulipotea hatua kwa hatua katika miaka ya 1990, lakini bado kuna shida ya mara kwa mara ambayo inahitaji kusafishwa.  <response>: The uncertainties of schedules and frequency of strike action gradually disappeared in the 1990s, but the occasional wrinkle still needs to be ironed out. 