Used vs. New Floor Traffic

For the past two years we have run a 80% new vs. 20% used ratio with our Black Book online lead generation tool and this past 4 months the ratio has switched to about 60% looking to buy used and only 40% looking for a value on their used car considering a New unit. We have worked really hard to keep our new unit sales “flat” vs. last year and are seeing an almost 35% increase in used volume as we keep and recondition older units we used to wholesale. What is happening on the ocasts?