It would have been unusual for the deficit not to go down following a recession. Just look at the past history (click the link and find Figure 1-1), all of the major deficits are directly correlated to recessions and the deficit went down after each recession.
What should be troubling to everyone is that the deficit goes back up from 2016-2026 even though we're not on hard economic times. To me, this signifies either stagnation in the growth of the economy, additional government spending, or a combination of both.
What's funny about this thread is that you're heralding Obama's deficit reduction (even though it's normal) but when it goes back up next year as the current projections indicate, you'll blast Trump for it even though it's entirely based on Obama's policies.
https://www.cbo.gov/sites/default/f...15-2016/reports/51908-2016outlookupdate-2.pdf