A dividend clarification: The 8.2% I posted was the top-20 average of total dividends to total revenue, which is not the same as Dividend Yield.
The yield is the dividend related to share price, which is what most investors actually care about, but share price of individual stocks is too volatile to be useful this far in advance. However, according to an article in Forbes in 2018, the average dividend yield for all dividend-paying pharmaceutical companies was around 2.4%.
I agree with others here that Anavex's dividend yield is likely to be higher than average due to lower costs.