Difficult.
Even global reporting companies rely on what the local authorities provide or reporting is like (like in Germany you get every car listed, regardless if the maker wants that or not), in Australia it is dependant on the state, you have to search in every state (if, where, how is it summarized,...) and sum that up.
Sometimes only types are listed, sometimes the brand (ok, easy for Ineos with uhhhh... two models) sometimes every single model is listed), some list them even if they sold less than 10, other sum them up under "other". In almost every case the manufacturer publishes the numbers themself, some reject to, like Ineos. But even low volume brands like Rolls Royce, Bentley or Skywell publish their numbers. Skywell is below Ineos in December with 4 units, Ineos 10 in the UK, for example. But still listed.
So if there is no official authority gathering the numbers, you depend on the brand to publish the numbers.
AWo
