Surely you'd need to know how many people get Salmonella poisoning from non-washed eggs (either historically or elsewhere in the world) to draw this conclusion.
So, atleast in germany, you're 3 times less likely to get infected by salmonella, relative to the population.
I would however note that there is no reliable statistic on how many of those are due to eggs and how many are from other sources, considering meat and other products can carry it as well.