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The graph above shows the City's sewer rates for the period <br /> 1984 - 1991. During 1984 and 1985 they were $29 .75 per quarter. <br /> From 1986 to 1988 they were $30.75, only $1. 00 more. In 1989 the <br /> rate increased sharply in response to a dramatic increase in the <br /> cost of sewage disposal charges. the 1990 and 1991 rate increases <br /> have been 4%. During the eight year period represented on the <br /> graph sewer rates increased 33 . 61% . That averages 4.20% per year. <br />