Not sure, but someone else may know more about this.
On CarJam NZ it has yearly totals and I think written off cars are deregistered.
Make
Model
Year
Count
Rank
TESLA
MODEL Y
2022
4,207
129
TESLA
MODEL Y
2023
3,930
146
TESLA
MODEL 3
2021
3,237
216
TESLA
MODEL 3
2022
2,733...