Are dart sports mostly gone

Crap....what happened in 1975 for the sales numbers to drop off so much ?? Then 1976, did buyers abandon the A bodies to buy Aspens and Volares ??
Writing was on the wall with smog and gas prices. Toyota and Datsun sales were up.
My first job in 76 pumping Mobil gas we were highest in town, full service premium $ 0.699 a gallon self service saved you a nickel a gallon. Regular at $ 0.599 self service. Unleaded was somewhere in the middle.