Stagnation isn't a good thing. The difference between you and all the nations I put it in that paragraph is that one is in between Communist nations with the trade seen before the war gone.
The other similar countries are affected by a variety of factors, however atm those factors haven't been strong enough to counteract the growth and turn it into negative growth. Thats why the nations also in the same category are larger nations but ones who have not seen war & conflict ravage their territory or who are so large / so rich that they can take a bit of heat economically though.
While you got others like the Ottomans who struggle for the inverse reasons. Troops & enemy ships everywhere. Or like Austria, poor Austria who is just getting gangbanged by everyone.
Throwing a fit because your nation starts declining over economy by a problem that can be fixed by 1 post w/ 2 sentences & some diplomacy then complaining that others are not doing as bad as you because "reasons"... You should've just done the obvious & get trade with those 2. Plus now it gives people reason to pursue peace perhaps through diplomacy & negotiation, or stop being idle in the wars and try to capture victory/peace before economic ruin kills the war effort.
Edit: Updated Current Maps, Fixed minor grammar & typing mistakes