With higher voltages, fewer transformers are needed. Power lines are buried, and transformers are generally larger and not exposed to weather.
I am not criticizing the infrastructure but as European (and this is something others told me) it feels weird to see transformers hanging from poles and every now and then blowing up.
And I mentioned the weather because my experience is that it usually happens during storms, it might be lightnings or tree branches but that is what I have seen.
At first I couldn't find equivalent European statistics, until I changed my search to "minutes", which is how Europe measures outages. The EU average in 2010-2014 was just over 2 hours, and as low as 29 minutes in Germany, or 20 here in Denmark.
[1] https://www.eia.gov/todayinenergy/detail.php?id=54639
[2] https://neon.energy/Neon_Data-quality_European-Commission.pd... (22nd page, figure 5)
Most power outages are broken wires. According to my utility underground wires break more often than above ground, and when they break are a lot more expensive to fix. (They are trying to make a point so this might need some salt, though i don't care enough to look up what)
Buried power lines solve most of these.
You won't find the statistic you want for Europe, as transformers don't explode enough for them to listed separately to any other fault.