Looked it up for Germany (my home) and it is just 9,7% of the working population:
https://de.statista.com/statistik/daten/studie/38297/umfrage...
Even though we have universal health care it is not free and not paid from taxes but from individual direct fees. the minimum monthly rate is currently a whopping ~400€ (450$). They will decrease the minimum rate to 200€ next year.