<prompt> Translate the following text to EnglishUtaratibu huo ulifuatwa na USPS na China katika miaka ya 1990 na kuanzishwa kwa mzunguko wa kiwango cha miaka minne na marekebisho ya katikati ya mzunguko.  <response>: It was a take--off on a joint USPS-PRC task force recommendation in the early 90s for a four-year rate cycle with a mid-cycle adjustment. 