note 6 : inventories we use the last-in , first-out ( lifo ) method for the majority of our inventories located in the continental u.s .
other inventories are valued by the first-in , first-out ( fifo ) method .
fifo cost approximates current replacement cost .
inventories measured using lifo must be valued at the lower of cost or market .
inventories measured using fifo must be valued at the lower of cost or net realizable value .
inventories at december 31 consisted of the following: .

2018
2017
Finished products
$988.1
$1,211.4
Work in process
2,628.2
2,697.7
Raw materials and supplies
506.5
488.8
Total (approximates replacement cost)
4,122.8
4,397.9
Increase (reduction) to LIFO cost
(11.0)
60.4
Inventories
$4,111.8
$4,458.3

inventories valued under the lifo method comprised $ 1.57 billion and $ 1.56 billion of total inventories at december 31 , 2018 and 2017 , respectively .
note 7 : financial instruments financial instruments that potentially subject us to credit risk consist principally of trade receivables and interest- bearing investments .
wholesale distributors of life-science products account for a substantial portion of our trade receivables ; collateral is generally not required .
we seek to mitigate the risk associated with this concentration through our ongoing credit-review procedures and insurance .
a large portion of our cash is held by a few major financial institutions .
we monitor our exposures with these institutions and do not expect any of these institutions to fail to meet their obligations .
major financial institutions represent the largest component of our investments in corporate debt securities .
in accordance with documented corporate risk-management policies , we monitor the amount of credit exposure to any one financial institution or corporate issuer .
we are exposed to credit-related losses in the event of nonperformance by counterparties to risk-management instruments but do not expect any counterparties to fail to meet their obligations given their high credit ratings .
we consider all highly liquid investments with a maturity of three months or less from the date of purchase to be cash equivalents .
the cost of these investments approximates fair value .
our equity investments are accounted for using three different methods depending on the type of equity investment : 2022 investments in companies over which we have significant influence but not a controlling interest are accounted for using the equity method , with our share of earnings or losses reported in other-net , ( income ) expense .
2022 for equity investments that do not have readily determinable fair values , we measure these investments at cost , less any impairment , plus or minus changes resulting from observable price changes in orderly transactions for the identical or similar investment of the same issuer .
any change in recorded value is recorded in other-net , ( income ) expense .
2022 our public equity investments are measured and carried at fair value .
any change in fair value is recognized in other-net , ( income ) expense .
we review equity investments other than public equity investments for indications of impairment on a regular basis .
our derivative activities are initiated within the guidelines of documented corporate risk-management policies and are intended to offset losses and gains on the assets , liabilities , and transactions being hedged .
management reviews the correlation and effectiveness of our derivatives on a quarterly basis. .

Question: Analyse this data from a financial earnings document. what was the percentage change in inventories between 2017 and 2018?
Choices:
0.92475
-319.56995
-0.07772
-0.3949
-12.86667
Correct choice index: 2