Where Trends data comes from
Google Trends analyzes a percentage of Google web searches to determine how many searches have been done for the terms you've entered compared to the total number of Google searches done during that time.
For example, if you search for
tea in Scotland in March of 2007, Trends analyzes a percentage of all searches for tea within the same time and location parameters.
Data that is excluded
- Searches made by few people: Trends only analyzes data for popular search terms, so terms with low volume won’t appear.
- Duplicate searches: Trends eliminates repeated queries from a certain user over a short period of time.