We produce a Swedish boardgame in Sweden for the Swedish market, which includes a 4 page leaflet describing the game rules. This was originally published in 2008. We are now producing a new batch, and are making a few very small adjustments in the rules (most essentially adding a note about our Facebook page).
What year should the new revision's copyright notice specify? 2008? 2019? 2008, 2019? 2008-2019? Anything else?