Considered unreliable by some but as an indication rather than an exact figure, relatively useful. Andy
Since over 10,000 bikes are shown as "Ducati unspecified model", i.e. they could be anything, figures for each model might be understated. When people register their new bikes with DVLA they are very often careless about the exact model (S, SP, SPS, PP, etc) and sometimes get it totally wrong, so the resulting aggregate figures are not remotely reliable.