There were many small scale wars in Europe between 1815 and 1914. They mostly had to do with German or Italian unification or nationalism if you prefer. But they didn't last longer than a few months at a time, much unlike previous decade long wars between France and England and Spain.
See post 6.
I come up with:
Three Italian wars of independence against Austria, in the last case allied with France.
Two Danish-German wars over Schleswig. (Not the best idea the Danes ever had!)
The Crimean War: Britain, France and Sardinia vs. Russia.
The Austro-Prussian War.
The Franco-Prussian War.
The Prussians were thus involved in four of the eight wars.
I haven't really compared this to other centuries in detail, but I seriously doubt there is another 100 year period in European history with fewer wars.