You can check the chart at the top of Marketing Activities to see the past three months.
Another way is to check your database on the last day of each month.
Another way is to pull a report in Marketo:
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Lead Performance
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Group by Created Date: All Time by Month
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Smart List = Member of Smart List NOT IN "Exclusions, tests, etc" <--block your own team and stuff that doesn't count
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Run Report.
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gives you a list.
Note that the day you started marketo or made big changes to your system may have abnormally large values.