Found it myself:
How many homes have won the Premier League?
On average,
Premier League teams consistently
win around 46.2% of
home games, while the draw occurs around 27.52% of the time and the away team are victorious in 26.32% of games.
https://help.smarkets.com/hc/en-gb/...-consider-home-advantage-for-football-trading
So given that every team plays every other team home and away, the above is a stark reminder that a home team has almost twice as much chance of winning a game than an away team, statistically.
You really belive that has nothing to do with the fans and everything to do with familiar surroundings? The German league (5 home wins from 27 games) says not, albeit it's a small size. We will know much more once the results are in for Germany, England and Spain at the end of July.