Hey R-community.
I used ggplot2, and I got this:

However, I think using a faceit_grid 2x2 is better to visualize the data clearer, but I have no idea on how to approach this.
My code for the plot in the image is:
DF <- data.frame(DF)
DF_long <- DF %>% pivot_longer(Jordbruk_skogbruk_fiske:Uoppgitt, names_to = "Næring", values_to = "Value")
head(DF_long)
ggplot(DF_long,aes(x = kvartal, y = Value,color = Næring, group = Næring)) + geom_line(size=1.7) + labs(x="År", y = "Antall sysselsatte") + scale_color_manual(values = c("aquamarine4","burlywood4","chartreuse","chocolate1","black","blue","blueviolet","gold","gold4","deeppink","lightcoral","olivedrab2","tomato","saddlebrown","mediumvioletred","lightseagreen","lightslateblue"))