MiBD conducted a store-check program in 700 French wine shops in 2015.
MiBD investigated Paris visiting 70 wine shops and collecting data of 19,544 wines.
Top sparkling wineries in France wine shops, by numeric distribution:
Top 1 Ruinart
Top 2 Roederer
Top 3 Bollinger
Top 4 Deutz
Top 5 Laurent-Perrier