Is bipolar disorder very common amongst Irish people?

The USA has the highest rate of bipolar disorder in the world. It is estimated at 4.4% of the population against a global average of 2.4%.

According to reports, 1 in 50 Irish citizens is diagnosed with bipolar disorder, which would place Ireland below the global average.

Bipolar has gone through phases of being "fashionable" compared to other versions of depression, so it is probably over-diagnosed in general.

I'd suggest there may be a cultural component of Irish people feeling less need to hide being bipolar compared to other countries that could give you the impression that Irish people suffer from it more.