ebooks in Australia for the large publishers have reached 10% but it is not across the board. It seems the printed version stilumates the sales of the best sellers. Those printed books that sell smaller quanties don't achieve the 10% for ebooks.
So the same principle applies. The author has to be well known or received significant publicity to achieve the sales.
Amazon is by far the largest share of approximately 70-75% with Kobo next.