The table they pull that data from is annual and only has info through 2022[1]. It's not useful for saying anything about the year-over-year monthly number being discussed. The chart showing monthly sales of road petroleum show a consistent 5% annual drawdown, which is proportional to how quickly the fleet is transitioning[2].

[1] https://www.ssb.no/en/statbank/table/11561 [2] https://robbieandrew.github.io/EV/img/fuelsales.png