John DeLorean wrote a book about his time at GM and a good portion is devoted to his promotion to Chevy General Manager February '69. Chevy had just switched over to a new IT system for 1969 and it was a disaster. Some dealers were never billed for cars they received. That's why there is a big gap in the NCRS data for '69.
67 & 68 data seems ok. '69, not so sure.
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