 Printed matter comprises essentially tax decals and passports supplied to the Malian government via the Canadian Bank Note Company.Hydroelectric energy-related exports (hydro poles, hydraulic turbines) were limited to the years 1997–2001.Because some product codes, particularly mechanical and electrical devices, are generic in nature and potentially employed by several sectors including mining, railways, or telecommunications, the aggregates in the following table are underreported to some extent.