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Figure 20: Historical System Efficiency (Accounted
for Water)
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| 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 |