Figure 20: Historical System Efficiency (Accounted for Water)
Calendar Year % Accounted for Water (including 1% Fire Fighting Allowance) Non-Account

3-Year Trend

1989 95.5 4.5 n/a
1990 94.3 5.7 n/a
1991 95.9 4.1 95.3
1992 92.7 7.3 94.3
1993 93.7 6.3 94.1
1994 95.6 4.4 94
1995 91.5 8.5 93.6
1996 76.6 23.4 88.2
1997 103.2 -3.2 90
1998 101.2 -1.2 93