My "private" e-mail address gets two or three e-mails a day from friends and the like.
If the numbers I noted on my pad are right, in the last 23 days I've received 3,779 spams. That's 165 a day or 98% of all incoming e-mail. I would guess that ratio isn't far different from the general population of non-spamming internet users.
Disconnecting Russia, China and Nigeria from the internet would probably reduce that dramatically.