Here's a comparison of US vs Canada C7 sales. For example, 37,288 were built in 2014. 34,839 sold in the US. 1,181 sold to Canada and 1,268 sold to overseas markets. That equates to 3.16% of the total built that came to Canada.
By 2017 Canada climbed to receiving over 5%, by 2018 up to about 8%, to about 9.5% for 2019. These last numbers do not include the overseas sales in the total built so the true calc Canadian percentage of cars received would be slightly less than those last numbers.