https://adwords.google.com/select/KeywordToolExternal When i go to above link and search for the popular keywords with the option 'global search volume trends' i see a list of results. At the bottom of these results there is one link that says 'download all keywords' .csv for excel When you download that file and see it shows the keywords with monthly search data and other things but there are no units of that values. I am not able to get the complete picture of these stats. what that all indicates? can anybody explain that details accurately?