Apple mysteriously stopped disclosing how much it spends on ads (AAPL)

Apple has stopped disclosing how much it spends on advertising, and it's not entirely clear why.
The company's latest annual report (10-K), filed with the Securities and Exchange commission in October, made no mention of its advertising expenses.
As analysts at Wells Fargo pointed out in a recent research note, that's a shame as it was useful to track Apple's advertising expense, and its ad spend as a percentage of revenue, over time.
The decision not to disclose ad spend for the full-year 2016