Not a single one of these was ever a stable democracy before becoming a dictatorship. Unless maybe you're referring to Vichy France, but that's more of an occupation.
Turkish democracy is barely 100 years old. If we are looking at a timeline of ~200 years, even the US won't come across as particularly stable, what with the Civil War and multiple Presidential assassinations since 1819.
None of those assassinations lead to a coup or revolution though, just peaceful transfer to the 2nd person in line. That seems like a vote for stability