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You are given user activity data for Google products. Write a SQL query to calculate the month-over-month growth rate of active users for a specific platform, using Google Maps as the target product. Treat an active user as a distinct user with at least one activity event in that month. Return each month, the active user count, the prior month's active user count, and the month-over-month growth rate as a percentage. For the first month in the result, the prior month and growth rate should be NULL.