I've often seen somewhere the stats of 40-50% of marriages ending in divorce. In the US, and also in many countries in Europe, at least.
But then I'm sure there's also tons of married couples who are pretty miserable but just keep on going because of any reason. Financial, kids, scared...
So if we add up divorce + unhappy marriages, how many are actually good ? Of course every couples meet relationship challenges, but like how many are in an overall positive marriage.
IMO I'd say about 30% maybe ?