Yep, bike numbers have been up every single month this year, with some significantly up.
Numbers I crunched from the eco-public website (2018 vs 2017):
I would assume that this is due to a number of factors. Personally, I've only been consistently biking into downtown since the opening of the new bridge and Pandora/Fort bike lanes. However, I'm sure construction, slight population increases, congestion, gas prices, and a number of other factors have had additive effects.
I was curious how these changes in cycling correlated with weather. Most months this year had relatively less rainfall than last year, though January, April and September had more rainfall than last year but still had increases. What astounded me was that January of 2018 (the second rainiest month this decade after Oct 2016) had over 4x the total rainfall of January 2017, yet still managed an increase of 16.7% ridership!