I believe at least 50% of them are still on the road too, although not at any one time... And only about 20% are for sale...
Sales must be well down on the peak, but guessing they are still selling reasonably well globally. Mine's sticking because it's a giggle and it's only by selling it that you realise a loss. PD - I don't think the 4 wheeled beast will ever quite replace the silly dairylea-cheese mobile!