how to cululate liquidity ratio for 2018 and 2019 for this company ?

General Motors Co (GM US) - Standardized in Millions of USD except Per Share FY 2018 FY 2019 12 Months Ending 12/31/2018 12/31/2019 Cash from Operating Activities + Net Income 8,014.0 6,732.0 + Depreciation & Amortization 13,669.0 14.118.0 + Non-Cash Items -5,051.0 -2,040.0 + Deferred Income Taxes -112.0 -133.0 + Other Non-Cash Adj 4,939.0 -1.9070 + Chg in Non-Cash Work Cap -1,376.0 -3,789.0 + (Inc) Dec in Accts Receiv + (Inc) Dec in Inventories + Inc (Dec) in Other -1,376.0 -3,789.0 + Net Cash From Disc Ops 0.0 0.0 Cash from Operating Activities 15,256.0 15,021.0 -8.761.0 0.0 0.0 0.0 Cash from Investing Activities + Change in Fixed & Intang + Disp in Fixed & Intang + Disp of Fixed Prod Assets + Disp of Intangible Assets + Acg of Fixed & Intang + Acq of Fixed Prod Assets + Ace of Intangible Assets + Net Change in LT Investment + Dec in LT Investment + Inc in LT Investment + Net Cash From Acq & Div + Cash from Divestitures + Cash for Aca of Subs + Cash for JVs + Other Investing Activities + Net Cash From Disc Ops Cash from Investing Activities -8,761.0 -8.761.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.00 -12.168.0 166.00 -20,763.0 -7.592.0 0.0 0.0 0.0 -7,592.0 -7,592.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 -3,307.0 0.0 -10,899.0 Cash from Financing Activities + Dividends Paid + Cash From (Repayment) Debt + Cash From (Repay) ST Debt + Cash From LT Debt + Repayments of LT Debt + Cash (Repurchase) of Equity + Increase in Capital Stock + Decrease in Capital Stock -2.242.00 11,664.0 1.186.00 43,801.0 -33,323.0 2,672.0 2,862.0 -190.00 -2,350.0 -2,531.0 -312.0 36,937.0 -39,156.0 457.0 457.0 0.0 + Other Financing Activities + Net Cash From Disc Ops cash from Financing Activities -640.0 0.0 11,454.0 -253.0 0.0 -4,677.00 Effect of Foreign Exchange Rates -299.0 2.0 Net Changes in Cash 5,648.0 -553.0 Cash Paid for Taxes Cash Paid for Interest 660.0 3,597.0 689.0 4,214.0 18,114.0 12.32 19,953.0 14.54 Reference Items EBITDA Trailing 12M EBITDA Margin Net Cash Paid for Acquisitions Tax Benefit from Stock Options Free Cash Flow Free Cash Flow to Firm Free Cash Flow to Equity Free Cash Flow per Basic Share Price to Free Cash Flow Cash Flow to Net Income Source: Bloomberg 6,495.0 7,113.7 7,429.0 8,130.1 4.60 7.27 1.90 5.22 7.02 2.23