This is what Google says about it:
This tool provides information about traffic to our services around the world. Each graph shows historic traffic patterns for a given country/region and service. You may select a country/region and then choose a service to view each respective graph. Graphs are updated as data are collected, normalized, and scaled in units of 0 to 100. By showing outages, this tool visualizes disruptions in the free flow of information, whether it's a government blocking information or a cable being cut.
Here it is:
Traffic – Google Transparency Report
Take a look at it, I think it's pretty amazing