Jan 19 (Reuters) - The Baltic Exchange"s dry bulk sea freight index (.BADI) fell for a ninth straight session on Wednesday, touching its lowest level in about a year, on weaker demand across all vessel segments. * The overall index, which factors in rates for capesize, panamax and supramax vessels, fell 74 points, or 4.5%, to 1,570, its lowest since February 2021. * The capesize index (.BACI) dropped 90 points, or 6.8%, to 1,226, its lowest since mid-February last year. * Heavy rains in Brazil led to a decline in iron ore inquiries from the area, while coal routes have come under further pressure in the current week, shipbroker Intermodal said in a weekly note dated Tuesday. * Average daily earnings for capesize vessels, which transport 150,000-tonne cargoes such as iron ore and coal, dropped by $744 to $10,169. * The panamax index (.BPNI) slipped 128 points, or 5.8%, to its lowest since April at 2,095. * Average daily earnings for panamax vessels, which ferry 60,000-70,000 tonne coal or grain cargoes, fell $1,159 to $18,852. * The supramax index (.BSIS) eased 28 points to 1,812.