Shortly after the turn of the decade, Toyota expects sales of its hybrid vehicles to crest the one million unit per year mark. ToMoCo's goal may seem a bit ambitious considering that it's only sold about 1.25 million hybrids since the Prius' introduction in 1997, but the alternative-power push will mainly be fueled by sales of upcoming plug-in hybrid models and Toyota's aim to equip every vehicle in its lineup with a hybrid drivetrain by 2020.