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It uses Data Preparation and Transformation for solution.
Step1: Sort the dataset on "Num_parts" and sample the top 1. After that you can join with theme dataset to find the theme as well.
Step2: Merge the datasets on themeID. Group the dataset on Theme and aggregate the "Set_Num" and sort the results
Step3: Group the dataset on Year. Aggregate the "Set_Num" count, Average of "Num_parts" and Sum of "Num_parts"