Great post, thanks for taking the time to share your data. I started tracking our expenses during lock-down, and have become totally hooked on it ever since. While I'm a long way from the OP's record, I've amassed 4 full years worth of data at this point, which has allowed me to start to see the trends. While costs vary from month to month, so far, total expenditure has been very stable, year to year.
We're at a very different stage in our lives with a young family, both of us working full time jobs, and all the associated (eye-watering) costs which go with that. The transition to a cash-less society has greatly helped though, everything goes on a card, so nothing gets left out, meaning we have the full picture (warts and all).
All that being said, having the information hasn't changed our spending. What it has done is give us confidence. Despite all the current costs, we know that for every €1 we're spending, €1 is being invested, setting us up for the future. We know that if either of us lost our jobs, exactly how long we could survive for, and what benefit cutting back different expenditure would yield. We know that once the house is repaid, and childcare/education costs are behind us, how much we'll need for our retirement. Knowledge is power, it's been a revelation, and all being well, 16 years from now, I hope I'll have followed in Cervelo's footsteps with my own 20 year summary.