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Dear Indika,
You can increase the number of clusters up to 25 by using the options menu (No of Items per group).
Then, you can add a filter to your query and execute it a few times with a different time period to gather the statistics:
AND DP:([01.01.1994 TO 31.12.2013])
AND DP:([01.01.1974 TO 31.12.1993])
...
Best regards,
Christophe
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