The Canadian dollar has fallen in recent times, alongside oil prices. The currency of Canada is correlated positively with oil prices, by virtue of Canada's export exposures to oil-related products. The chart below indicates that mineral products (i.e., including crude petroleum and refined petroleum, among others) represented over 24% of all Canadian exports in 2017.
(Source: Observatory of Economic Complexity)
It is also worth noting that transportation products (including cars and vehicle parts) represented a further 19% or so of Canadian exports. Meanwhile, metals represented over 8% of total exports (this includes aluminium-related products,