The most Iconic car of each decade in my book:
1950’s: Aston Martin DB4 Zagato
1960’s: Corvette Stingray
1970’s: Lamborghini Countach
1980’s: Ferrari Testarossa
1990’s: Porsche 911 993 Turbo or Mazda RX7
2000’s: Audi TT or Aston Martin Vantage
2010’s: Tesla Model 3 (making a prediction here)