The following table contains current asset and current liability balances for Deere and Company (DE):

($ thousands)	2013		2012		2011
Current assets
Cash and cash equivalents	22,205,400		2,128,900		1,611,600
Short-term investments	00		1,579,600		00
Net receivables	3,843,300		3,660,000		3,405,400
Inventory	2,920,600		2,299,800		1,959,500
Total current assets	8,969,300		9,668,300		6,976,500
Current liabilities
Accounts payable	6,653,100		3,187,200		4,653,700
Short-term/current long-term debt	8,437,300		10,027,300		8,268,600
Other current liabilities	00		02,894,000		00
Total current liabilities	15,090,400		16,108,500		12,922,300

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?