<P> A maple syrup production farm is called a "sugarbush" or "sugarwood". Sap is often boiled in a "sugar house" (also known as a "sugar shack", "sugar shanty", or cabane à sucre), a building louvered at the top to vent the steam from the boiling sap . </P> <P> Maples are usually tapped beginning at 30 to 40 years of age . Each tree can support between one and three taps, depending on its trunk diameter . The average maple tree will produce 35 to 50 litres (9.2 to 13.2 US gal) of sap per season, up to 12 litres (3.2 US gal) per day . This is roughly equal to seven percent of its total sap . Seasons last for four to eight weeks, depending on the weather . During the day, starch stored in the roots for the winter rises through the trunk as sugary sap, allowing it to be tapped . Sap is not tapped at night because the temperature drop inhibits sap flow, although taps are typically left in place overnight . Some producers also tap in autumn, though this practice is less common than spring tapping . Maples can continue to be tapped for sap until they are over 100 years old . </P> <P> Until the 1930s, the United States produced most of the world's maple syrup . Today, after rapid growth in the 1990s, Canada produces more than 80 percent of the world's maple syrup, producing about 73,000,000 litres (19,000,000 US gal) in 2016 . The vast majority of this comes from the province of Quebec, which is the world's largest producer, with about 70 percent of global production . </P> <P> As of 2016, Quebec had some 7,300 producers working with 13,500 farmers, collectively making over 8,090,000 US gallons (30,600,000 L) of syrup . Production in Quebec is controlled through a supply management system, with producers receiving quota allotments from the Federation of Quebec Maple Syrup Producers (Fédération des producteurs acéricoles du Québec, FPAQ), which also maintains reserves of syrup, although there is a black - market trade in Quebec product . In 2017, the FPAQ mandated increased output of maple syrup production, attempting to establish Quebec's dominance in the world market . Canada exported more than C $362 million of maple syrup in 2016 . The provinces of Ontario, Nova Scotia, New Brunswick, and Prince Edward Island produce smaller amounts of syrup . </P>

How much of the world's maple syrup does canada produce