It's clear that the most deaths occur during "flu season" and that 2008's numbers are higher than 2009's for at least a significant portion of the year. It gets harder to tell in the middle there where too many lines overlap.

Still, the numbers don't really say too much without factoring in other information. Maybe more people died in the past couple of years because there were more flu shots given. Or less. Or because more people were depressed at their financial situation, lowering their immune system.

When the zombie population dies off, those of us who survive will be able to start tracking statistics again, but I suspect there will be a few blank years...