Well, it would be -24 for me, if you count my wife's Saturns. Yes, there are plenty of domestic cars I'd like to have, but my early years were a little, ahem, skewed.
22 VWs (mostly air-cooled)
1 BMW 2002
1 Datsun Fairlady Z (yes, a Fairlady RHD 2 liter)
1 Toyota Sienna
2 different Saturns
That's all I can think of right now. I'd bet that there are more that I've forgotten.
If nobody beats that as a negative, do I win anything?