Banknotes of the Canadian dollar are the banknotes or bills (in common lexicon) of Canada, denominated in Canadian dollars (CAD, C$, or $ locally). Currently, they are issued in $5, $10, $20, $50, and $100 denominations. All current notes are issued by the Bank of Canada, which released its first series of notes in 1935. The Bank of Canada has contracted the Canadian Bank Note Company to produce the Canadian notes since then. The current series of polymer banknotes were introduced into circulation between November 2011 and November 2013. Banknotes issued in Canada can be viewed at the Bank of Canada Museum in Ottawa. Currently produced series The currently produced banknote series of the Canadian dollar both consist of polymer banknotes: the 7th series (Frontier), which was launched in 2011, and the 8th series, which was launched in 2018. Production Notes are issued by the Bank of Canada, but the actual production of the banknotes is outsourced to the Canadian Bank Note Company in accordance with the specifications and requirements of the Bank of Canada. All wording on the notes appears in both of Canada's official languages, English and French. Banknotes were printed on paper composed of pure cotton. Cotton fibre was discontinued and replaced by a synthetic polymer starting in 2011, with the last of the paper banknotes being made available in November 2013. Counterfeiting Efforts to reduce counterfeiting in recent years have sharply reduced the number of counterfeit notes in circulation. The number of counterfeit notes passed annually in Canada peaked in 2004, when 553,000 counterfeit notes were passed. Counterfeiting has decreased annually since that peak, with only 53,536 notes passed in 2010. The new Frontier series of banknotes significantly improves security primarily by using a polymer substrate to make up the note instead of the previously used fabric. Even as Canada's counterfeiting problem escalated, the shift to polymer was viewed as too expensive. A polymer note costs 19 cents to produce, compared to 9 cents for a typical cotton-paper note. All older cotton-paper banknotes prior to the 2013 polymer series are now considered unfit for circulation due to their lacking of modern security features, such as a metallic stripe. Financial institutions must return the banknotes to the Bank of Canada, which will destroy them. Individuals may keep the banknotes indefinitely. Counterfeiting is measured using a system borrowed from chemistry known as parts per million (PPM). Normally used