Table: royal canadian mint numismatic coins (2000s)
Question: Are there any differences in the issue price of coins from the same theme but different years? Answer with only 'Yes' or 'No' that is most accurate and nothing else.
Step 1 (Operation, Indexing): theme
Step 2 (Operation, Grouping): theme
Step 3 (Operation, Filter): year
Step 4 (Reasoning, Reasoning with Quantifiers): existential, any differences
Answer: Yes