It's the December 31, 2015 value that was $65,593. I thought that the entire 90% drop in value occurred during 2016, but reading the question again I see that this drop occurred over two years, not one, so my calculation was erroneous. A higher current balance than I thought does make it more likely that distributions from the traditional IRA may need to be limited to avoid possible additional taxation of Social Security benefits and increase in Medicare premiums. The tradeoffs are difficult to model.
