Analyzing Google Search traffic drops | Google Search Central Blog - 0 views
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If you'd like to extend the 16 month, you could use the Search Analytics API to pull data and store it in your systems.
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Check top queries in your region and compare them to the queries that you're getting traffic from, as shown in Search Console's Performance report. If there are queries missing from your traffic, check if you have content on that subject and make sure it's being crawled and indexed.