$($Related to Checkpoint $18\mathrm{.}1)($Measuring firm liquidity$)$ The following table contains current asset and current liability balances for Deere and Company $($DE$)$: $.$

a$.$ Measure the liquidity of Deere & Co$.$ for each year using the company's net working capital and current ratio.

b$.$ Is the trend in Deere's liquidity improving over this period?

a$.$ The company's net working capital for $2011$ is $ $($Enter your answer in thousands of dollars.$)$

Data table

$($Click on the icon $$ in order to copy its contents into a spreadsheet.$)$