From the article: "saw the iPads share slide to 61.3%" And the article is about Apple, thus the thread is about Apple. Check out this chart:
And think of the free-fall that was necessary in order for Apple to overtake Nokia worldwide.
Now, you claim Nokia has a big presence in the US - put up or shut up. What is their big presence in the US?
Nokia's big volume presence in the US, as well as the world, is in standard phones, not smart phones. Their smart phone segment has been dropping steadily year after year. Nokia realized this, which is why they're dropping Symbian and betting the future on a Windows Phone partnership.
What is Nokia’s market share in the US, over the last 6-7 years, please? Care to answer that?
Android has already surpassed iOS for mobile devices - even if you include the iPad and iTouch.
Sorry, they’re on the slide down, and they show no signs of slowing. Losing market share for tablets (your graphs show nothing), and already hoping to cling to 3rd place in smartphones...