Given the top subcategories identified as 'Personal Transformation', 'Early Learning', 'Analysis & Strategy', 'Literature & Fiction', and 'Contemporary Fiction', we'll proceed to compare their sales trends. However, to perform this analysis, we need to have time-series data indicating how sales have changed over time for each subcategory.
Unfortunately, the current dataset does not provide direct time-series data for monthly sales per subcategory. To proceed, we would need additional data that includes sales figures across different months or periods for these subcategories.
If you have such data available or if there's another aspect of the dataset you'd like to explore, please let me know! Otherwise, could you clarify how you'd like to proceed with the comparison of sales trends without specific time-series data?