The horizontal analysis calculations have been carried out. 2016 was used as the base year. Assist in interpreting the significant trend from the information provided below:

 

(In millions, except share and per share data) ASSETS Property, plant and equipment Accumulated depreciation Property, plant and equipment, net Current assets: Cash and cash equivalents Restricted funds Accounts receivable, net of allowance for uncollectible accounts of $60 and $41, respectively Unbilled revenues Materials and supplies Assets held for sale Other Total current assets 2020 2019 2018 28.37% 19.98% 16.29% 18.98% 15.05% 16.79% 31.47% 21.61% 16.12% 629.33% -20.00% 45.00% 55.00% 73.33% 40.00% 19.33% 9.29% -21.67% -34.60% 20.51% 12.82% #DIV/0! #DIV/0! #DIV/0! -92.37% -100.00 % -119.49% 34.00% 22.72% 14.83% 11.90% -29.28% 5.13% 2017 2016 8.83% 100.00% 10.24% 100.00% 8.36% 100.00% -26.67% 100.00% 35.00% 100.00% 100.00% 1.12% 100.00% -19.39% 100.00% 5.13% 100.00% #DIV/0! 100.00% -104.24% 100.00% 5.41% 100.00%