After checking the graphs properly, true, but I am not sure about the significance. For the Forint, you see one macro-event: the 2006 elections (spending promises atop loose spending) and the following mess, when the budget was under threat to blow up. On shorter timescales, fluctuations are bigger (say 3% for HUF, 2% for CZK and PLN), but not that much. Otherwise, you have no secular trend, that is you have a constant trend. (Indeed people calculated in the head with 250 Forints an Euro by default in the past few years.)

_{*Lunatic*, n.
One whose delusions are out of fashion.}