I've always been a stats guy. For many years I kept track of every trout I caught too. I still do for each season, but not anywhere permanent.

For hunting I have a log book that I write things down in. I transferred all the info from my old notebooks. Some years I have very little info, but have the date, time, weapon, sex, shot distance & recovery and method for every deer I've killed.
Over the last few years I have info for every hunt. I've always found keeping track very neat.