It's a fun project, but I wish the years weren't locked to 5 year intervals.
EDIT: Actually many years are missing, it seems. For Norway there's nothing between 2000 and 1985, but I guess that's how the charts are pulled?
I also noticed that when you only have these 5 year jumps, certain genres are completely missing. Take US charts - Grunge is non-existent, as it had not yet hit the charts in 1990, and by 1995 it was over.
EDIT: Actually many years are missing, it seems. For Norway there's nothing between 2000 and 1985, but I guess that's how the charts are pulled?
I also noticed that when you only have these 5 year jumps, certain genres are completely missing. Take US charts - Grunge is non-existent, as it had not yet hit the charts in 1990, and by 1995 it was over.