426% increase in pax numbers on that route from December 2016 to 2017
Don't forget there would not have been many flights in December itself, as the ski season doesn't really start in earnest until mid-month (the first EZS flight was on the 16th), so you're probably comparing maybe 3 or 4 A320 loads plus a similar no. of BEE Q400 loads in 2017, versus just the Q400 loads in 2016. In that case a big increase should have been expected.
January YoY will be much more representative.
Seems like good news though.