pre_text: Inventories The components of inventories consist of the following (in millions): Inventories are valued at the lower of cost and net realizable value using the first-in, first-out method. Inventory impairment charges establish a new cost basis for inventory and charges are not subsequently reversed to income even if circumstances later suggest that increased carrying amounts are recoverable.
table: March 31,
table: 2019 2018
table: Raw materials $74.5 $26.0
table: Work in process 413.0 311.8
table: Finished goods 224.2 138.4
table: Total inventories $711.7 $476.2
question: Analyse this data from a financial earnings document. What was the change in raw materials between 2018 and 2019?