Past medical expenses... hmmm, I'll just stick to last year since it's obviously recent, but I've had plenty of others throughout life.
Last Year alone -
*Daughter born premature by 3 months
*Birth of daughter
*Nasal correction surgery for myself
*I take an expensive medication for epilepsy - cost is roughly $800 for a 30-day supply.
At the end of the year: I paid about $2,000 for carrying the insurance, and ~$5,000 for the entire year's procedures and prescriptions. My insurance paid over $1.3m IIRC. I would pull it up and show a screenshot if the UHC website has a way to but it seems to only show this year.
So overall, cost me $7k, and $2k of that was before taxes. Also have HSA investments and contributions from my employer that also offset some of these costs. So to put that in terms of how much of a percentage healthcare last year cost me less than 4% of our income... and last year that was obviously a case where we had a drastically more medical expenses than normal.
Taxation. Check the tax rates of all the countries you guys love to idolize with their single payer systems