I have been doing this for approx 20 years.
Anyway I was having a good look through it earlier on and found it quite fascinating how my reading tastes have changed, how I had prolific years (when dd was born I had to stop work for 10 weeks before she was born, then read while feeding her which was approx 23 hours per day
, so read loads that year.) and years where I read very little ( when dh was very ill and I couldn't concentrate on much)
I had a Ruth Rendall/ Barbara Vine year, a couple of chick lit years...
Nowadays I seem to read fewer books but they are a bit more challenging.
So who else does this? Oh and what it is written in? I have a very nice notebook, bought in a craft Market!