The Tesla stock price opened at $212.38 Thursday, meaning the stock has fallen 27.1% since the all-time it hit in September.

Tesla stock’s dip has coincided with the plummet in crude oil prices. At this week’s five-year low of $53.60 a barrel, WTI crude oil is now down 47.7% in the last six months. Brent oil trades just above $61 a barrel today. The global benchmark priced over $110 a barrel this summer.

And while falling oil prices are being blamed for Tesla’s drop, there’s another more important reason the stock is down…