4 people per week in the USA [1]. GFCI devices would prevent almost all of those. There are a very small number of ways to electrocute yourself even with a GFCI installed, but you are unlikely to find one of those unless you have electrical expertise and are suicidal.

There are a few things that aren't practical to protect with a GFCI, such as high voltage grid power transmission cables. But people killed by those I wouldn't think are included in deaths 'at home'.

[1]: https://www.cullanlaw.com/blog/2015/may/may-is-national-elec...