I now have from my part D insurer (United Health Care) the exact figures. It seems I was right the first time, at least according to them.
In December, 2019, Abbvie charged $13, 040.53 US for 28 420 mg. tablets. In January, 2020 they raised the price to $14,036.52, an increase of $996. This is more or less their pattern, an increase in January of each year. Then in April the cost was again increased, this time to $14,733.36, a further increase of $697. The two increases total $1692.83 for a 4 week supply, a 13% increase. That totals an increase of $22006.79 per year. The total cost of one year of Imbruvica 420 mg. tablets, assuming United Health Care is accurate (and I assume they are) is $191,533.68.
My copay last year was $652 a month after I went into the "catastrophic stage", which happens in January of each year. Then it went up to $701.83. Now it's $734.
I see no reason why it can't go up again next month if Abbvie decides to do so.