NHTSA.gov
As automotive marketplace demands more and more options from manufacturers, the level of difficulty to produce those products increase.

The chart is from NHTSA.org report on recalls.

NHTSA 2017 Recall report can be viewed here

Recall trends 1997 - 2017 from automotive manufacturers - what is traceability?

NHTSA Recall Trend 1997 – 2017 – Chart