1origin_date,ar_const,ar_phi22024-01-31,1.740987811847352,0.3411245875026397432024-04-30,1.735383972337271,0.34032425553200742024-07-31,1.7410078382331322,0.33918249131963352024-10-31,1.7535732188313151,0.34223437077209862025-01-31,1.7525583227108583,0.342107505368894272025-04-30,1.731218830940902,0.3434753538685668782025-07-31,1.7547184424238143,0.337759944251462592025-12-31,1.7761306755042419,0.335342767512071410