operating cash flow from continuing operations for 2017 was $ 2.7 billion , a $ 191 million , or 8 percent increase compared with 2016 , reflecting higher earnings and favorable changes in working capital .operating cash flow from continuing operations of $ 2.5 billion in 2016 was a 23 percent increase compared to $ 2.0 billion in 2015 , as comparisons benefited from income taxes of $ 424 million paid on the gains from divestitures in 2015 .at september 30 , 2017 , operating working capital as a percent of sales increased to 6.6 percent due to higher levels of working capital in the acquired valves & controls business , compared with 5.2 percent and 7.2 percent in 2016 and 2015 , respectively .operating cash flow from continuing operations funded capital expenditures of $ 476 million , dividends of $ 1239 million , common stock purchases of $ 400 million , and was also used to partially pay down debt in 2017 .proceeds of $ 5.1 billion from the sales of the network power systems and power generation , motors and drives businesses funded acquisitions of $ 2990 million , cash used for discontinued operations of $ 778 million and repayments of short-term borrowings and long-term debt of approximately $ 1.3 billion .contributions to pension plans were $ 45 million in 2017 , $ 66 million in 2016 and $ 53 million in 2015 .capital expenditures related to continuing operations were $ 476 million , $ 447 million and $ 588 million in 2017 , 2016 and 2015 , respectively .free cash flow from continuing operations ( operating cash flow less capital expenditures ) was $ 2.2 billion in 2017 , up 8 percent .free cash flow was $ 2.1 billion in 2016 , compared with $ 1.5 billion in 2015 .the company is targeting capital spending of approximately $ 550 million in 2018 .net cash paid in connection with acquisitions was $ 2990 million , $ 132 million and $ 324 million in 2017 , 2016 and 2015 , respectively .proceeds from divestitures not classified as discontinued operations were $ 39 million in 2017 and $ 1812 million in 2015 .dividends were $ 1239 million ( $ 1.92 per share ) in 2017 , compared with $ 1227 million ( $ 1.90 per share ) in 2016 and $ 1269 million ( $ 1.88 per share ) in 2015 .in november 2017 , the board of directors voted to increase the quarterly cash dividend 1 percent , to an annualized rate of $ 1.94 per share .purchases of emerson common stock totaled $ 400 million , $ 601 million and $ 2487 million in 2017 , 2016 and 2015 , respectively , at average per share prices of $ 60.51 , $ 48.11 and $ 57.68 .the board of directors authorized the purchase of up to 70 million common shares in november 2015 , and 56.9 million shares remain available for purchase under this authorization .the company purchased 6.6 million shares in 2017 under the november 2015 authorization .in 2016 , the company purchased 12.5 million shares under a combination of the november 2015 authorization and the remainder of the may 2013 authorization .a total of 43.1 million shares were purchased in 2015 under the may 2013 authorization .leverage/capitalization ( dollars in millions ) 2015 2016 2017 .
[['( dollars in millions )', '2015', '2016', '2017'], ['total assets', '$ 22088', '21732', '19589'], ['long-term debt', '$ 4289', '4051', '3794'], ["common stockholders' equity", '$ 8081', '7568', '8718'], ['total debt-to-total capital ratio', '45.8% ( 45.8 % )', '46.7% ( 46.7 % )', '34.8% ( 34.8 % )'], ['net debt-to-net capital ratio', '31.3% ( 31.3 % )', '31.3% ( 31.3 % )', '15.4% ( 15.4 % )'], ['operating cash flow-to-debt ratio', '29.8% ( 29.8 % )', '37.7% ( 37.7 % )', '57.8% ( 57.8 % )'], ['interest coverage ratio', '20.2x', '11.8x', '12.6x']]
total debt , which includes long-term debt , current maturities of long-term debt , commercial paper and other short-term borrowings , was $ 4.7 billion , $ 6.6 billion and $ 6.8 billion for 2017 , 2016 and 2015 , respectively .during the year , the company repaid $ 250 million of 5.125% ( 5.125 % ) notes that matured in december 2016 .in 2015 , the company issued $ 500 million of 2.625% ( 2.625 % ) notes due december 2021 and $ 500 million of 3.150% ( 3.150 % ) notes due june 2025 , and repaid $ 250 million of 5.0% ( 5.0 % ) notes that matured in december 2014 and $ 250 million of 4.125% ( 4.125 % ) notes that matured in april 2015 .the total debt-to-capital ratio and the net debt-to-net capital ratio ( less cash and short-term investments ) decreased in 2017 due to lower total debt outstanding and higher common stockholders 2019 equity from changes in other comprehensive income .the total debt-to-capital ratio and the net debt-to-net capital ratio ( less cash and short-term investments ) increased in 2016 due to lower common stockholders 2019 equity from share repurchases and changes in other comprehensive income .the operating cash flow from continuing operations-to-debt ratio increased in 2017 primarily due to lower debt in the current year .the operating cash flow from continuing operations-to- debt ratio increased in 2016 primarily due to taxes paid in 2015 on the divestiture gains and lower debt in 2016 .the interest coverage ratio is computed as earnings from continuing operations before income taxes plus interest expense , divided by interest expense .the increase in interest coverage in 2017 reflects lower interest expense in the current year .the decrease in interest coverage in 2016 reflects lower pretax earnings , largely due to the divestiture gains of $ 1039 million in 2015 , and slightly higher interest expense .in april 2014 , the company entered into a $ 3.5 billion five- year revolving backup credit facility with various banks , which replaced the december 2010 $ 2.75 billion facility .the credit facility is maintained to support general corporate purposes , including commercial paper borrowing .the company has not incurred any borrowings under this or previous facilities .the credit facility contains no financial covenants and is not subject to termination based on a change of credit rating or material adverse changes .the facility is unsecured and may be accessed under various interest rate and currency denomination alternatives at the company 2019s option .fees to maintain the facility are immaterial .the company also maintains a universal shelf registration statement on file with the sec under which .

Question: what percentage of total debt was long-term debt in 2017?
Answer: 81%