HATTRICK without resetting the count to 0 every round in CS1.5

The HATTRICK keeps accumulating the number of victims every round without resetting the count to 0. Is this the expected behavior?

e.g. each line is shown at the end of each round:
```
QUAKE SOUNDS aaa HAD 11 VICTIMs.
QUAKE SOUNDS aaa HAD 20 VICTIMs.
QUAKE SOUNDS aaa HAD 30 VICTIMs.
QUAKE SOUNDS aaa HAD 50 VICTIMs.
...
```