Number of IPs (non unique users) per country :

Country Unique IPv4 Addresses
Global
808,399,167
United States
140,060,201
China
126,496,759
Brazil
48,342,314
Japan
45,782,047
Germany
36,339,015
United Kingdom
31,095,823
France
30,393,326
South Korea
24,506,931
Russia
19,473,367
India
17,016,708

Source : https://www.akamai.com/us/en/multime...rt-q1-2016.pdf