Nick D, PaulST4 and I were actually talking about this last night but in the context of "why does it seem like there are no parts for my SS or ST? This should put things into context for 2004:
Line #Units %of total
Superbike 10,213 27.9%
Supersport 1,426 3.9%
Monster 18,027 49.3%
ST 2,996 8.2%
Multistrada 3,898 10.7%