The evidence strongly supports the statement. The most authoritative and relevant sources are the primary sources from the Polymarket website itself. These sources provide a clear timeline of the prediction odds. One source establishes a historical high for the odds at 34%, while another shows a more recent historical point at 21%. Two other sources confirm the current odds are 17%. The progression from 34% to 21% and finally to 17% is a clear and unambiguous decrease, directly verifying the statement. The evidence is consistent across all relevant primary sources, and there is no conflicting information. Several other sources were correctly identified as irrelevant as they pertained to different financial assets (PLUG, TSLA) or did not contain the specific odds data required.