Beer in Belgium includes pale ales, lambics, Flemish red ales, sour brown ales, strong ales and stouts. In 2018, there were 304 active breweries in Belgium, including international companies, such as AB InBev, and traditional breweries including Trappist monasteries. On average, Belgians drink 68 liters of beer each year, down from around 200 each year in 1900. Most beers are bought or served in bottles, rather than cans, and almost every beer has its own branded, sometimes uniquely shaped, glass. In 2016, UNESCO inscribed Belgian beer culture on their list of the intangible cultural heritage of humanity. History In Belgium, beer was already produced in the Roman era, as evidenced by the excavation of a brewery and malthouse from the 3rd and 4th centuries AD at Ronchinne. During the Early and High Middle Ages, beer was produced with gruit, a mix of herbs and spices that was first mentioned in 974 when the bishop of Liège was granted the right to sell it at Fosses-la-Ville. From the 14th century onwards, gruit was replaced by hops, after the example of imported beers from northern Germany and Holland. After that, several Belgian towns developed their own types of beer for export to other regions, most notably the white beer of Leuven and Hoegaarden, the caves of Lier and the uitzet of Ghent. Monasteries played only a small role in beer production and mostly brewed for their own consumption and that of their guests. Monastic brewing would only receive some renown from the late 19th century onwards, when the trappists of Chimay produced a brown beer that was commercially available. In 1885, a change in legislation made brewing of German-style bottom-fermenting beers viable in Belgium, and it was only from then that large industrial-scale brewing in Belgium took off. During the 20th century the number of breweries in Belgium declined from 3223 breweries in 1900 to only 106 breweries in 1993. Yet, a number of traditional beer styles, such as white beer, lambic and Flemish old brown were preserved, while new local, top-fermented styles developed, such as spéciale belge, abbey beer and Belgian strong ale. In 1988, the country's two biggest breweries, Artois and Piedboeuf, formally merged to become Interbrew, then the world's 18th biggest brewer, which was to merge with AmBev in 2004 to become today's AB InBev, the biggest beer producing company in the world. Methods In Belgium, four types of