First taking the BAM brands out of the equation, how are things shaping up in Norway? From 2010 to 2016, other premium sales were up 29%. Now individually: Lexus +550% JLR +393% (LR +327% Jag +509%) Porsche 164% Volvo -16% Alfa Romeo -89% Cadillac -67%. Tesla is too high to mean anything.
Summary: Tesla, Lexus, Land Rover and Jaguar grew the most. Volvo has slipped over the period from a very high position. They and Alfa Romeo will be hoping to make a comeback soon.
Now adding the other brands to the BAM marques, how do things stack up? Total sales growth goes to +55%, due to the BAM brands increasing 72%. Volvo was easily the biggest premium brand in 2010 but were overtaken by BMW/Mini in 2015 and Mercedes in 2016. The 'Others' took 40% in 2010 but fell sharply in 2016. The BAM marques took 67% of all premium sales in 2016.
Summary: The BAM trio have been taking sales away from Volvo, it's as simple as that. Audi has been passed by the other two BAM brands. The three biggest in 2016 were 1) BMW & Mini, 2) Mercedes 3) Volvo.
Data source: Ofvas.
Text source: RayCee.