The current values of two-year old luxury cars are showing retention trends of more than three percentage points lower than prior year's retention for similar vehicles at this point in their life-cycle.

The report showed that 2014-MY luxury cars had a 51% retention rate in August. During the same time last year, 2013-MY luxury cars showed a retention trend percentage of approximately 54%, and the year before that just under 55% for 2012-MY vehicles, according to the Aug. 23 Black Book Market Insights report.

Meanwhile, the report also noted that overall car segment values decreased by 0.78% from Aug. 12 to Aug. 19., with prestige luxury cars showing the heaviest vehicle deprecation of the segment by 1.02%.

“Wholesale values of car segments continue their decline, now at the fastest pace seen this year, while most truck and SUV segments show stability,” said Anil Goyal, senior vice president of automotive valuation and analytics.