However, the most costly year for the force was 2014 which saw the repair bill reach a total of $2.5m, compared to 2015's $2.4m bill.
A police spokesperson said ideally the number of crashes its fleet was involved in would be zero.
But he said, the reality was they worked in a "dynamic and at times high-risk environment" which means crashes were inevitable from time to time.
"The reality is that we police work in a dynamic and at times high-risk environment, which means that there will inevitably be occasions when crashes will occur.
"As noticed in the data this can happen either though the deliberate actions of others, or through crashes and other incidents that occur in the course of police staff doing their duties."
The spokesperson said given police had more than 3000 vehicles on the road, with staff working 24/7 and clocking up more than 90 million kilometres annually in a range of conditions they had a "generally excellent safety record".
"Police officers are also trained to drive to a very high standard in often difficult and stressful situations.
"We are always evaluating and adapting our driver training programme to ensure we maximise public safety, while balancing the need to respond to crime and crashes to keep our communities safe."
Cars written off
2011: 20
2012: 22
2013: 23
2014: 37
2015: 32
Total damages in five years
• 5079 cars
• $11.4m spent