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Chicago Mercantile Exchange started trading bitcoin futures on 17 December 2017.
Kaká announced his retirement on 17 December 2017, after turning down offers from former clubs São Paulo and Milan. He also expressed interest in working as a director, confirming that his former club Milan had offered him a role.
Prices started at $998 in 2017 and rose to $13,412.44 on 1 January 2018, after reaching its all-time high of $19,783.06 on 17 December 2017.