The Dachau camp was the first to open in 1933.
It first housed political dissidents, gypys, homosexuals, and others.
Jewish people first arrived in 1938.
So, we have 1938 as the starting point.
The other 11 camps followed.
Many people died of disease and lack of medical care.
So, it is hard to calculate exactly how many died by execution in alll it's forms.