Yeah, that sounds about right. It depends if you want to classify attempted revolts and revolutions as "wars". I think the Hungarians tried one against the Austrians that the Russians helped put down. The 18th century was much more violent than the 19th, at least as Europe proper is concerned.
18th century wars were more frequent but can't compare to the casualties seen in Europe during the first 15 years of the 19th century. Even Frederick, with his massed musket fire, couldn't even come close.