<prompt> Translate the following text to SwahiliFigure 6-5 shows the number of systems installed over an eight-year period, with most of these systems 97 of 137 installed during two consecutive years 1989-1990.  <response>: Picha ya 6-5 inaonyesha idadi ya mifumo iliyowekwa katika kipindi cha miaka minane, na wengi wa mifumo hii 97 kati ya 137 imewekwa katika miaka miwili mfululizo 1989-1990. 