How many IPv4 addresses are used for dynamic assignment through ISPs?

From the IPv4 addresses, we have the private addresses (10.x, 172.x, 192.x), localhost addresses (127.x), self-assigned (169.x) multicast and broadcast addresses.

From the remaining, I guess a lot of addresses are assigned to large companies, use for web servers etc.

How many IPv4 addresses (roughly) are used for dynamic assignment by ISPs to users for dial-in connections like DSL router etc.?

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