As of and for the Years ended December 31,
As of and for the Years ended December 31,
As of and for the Years ended December 31,
As of and for the Years ended December 31,
As of and for the Years ended December 31,
2019(1)(8)
2018(2)
2017(3)
2016(4)
2015(5)
Operations data:
Net revenues
$  5,366.8
$   5,191.2
$   4,607.5
$   3,789.9
$  3,582.4
Gross profit
3,427.1
3,279.5
2,864.8
2,332.4
2,164.6
Income from operations
1,498.4
1,396.4
1,210.2
1,054.6
1,027.9
Net earnings(6)
1,767.9
944.4
971.8
658.6
696.1
Per share data:
Basic earnings per share
$      17.02
$        9.15
$       9.51
$       6.50
$       6.92
Diluted earnings per share
$     16.82
$       9.05
$       9.39
$       6.43
$       6.85
Dividends declared per share
$   1.9000
$   1.7000
$    1.4625
$    1.2500
$   1.0500
Balance sheet data:
Cash and cash equivalents
$     709.7
$     364.4
$      671.3
$     757.2
$     778.5
Working capital(7)
(505.4)
(200.4)
(140.4)
(25.0)
126.2
Total assets
18,108.9
15,249.5
14,316.4
14,324.9
10,168.4
Current portion of long-term debt
602.2
1.5
800.9
401.0
6.8
Long-term debt, net of current portion
4,673.1
4,940.2
4,354.6
5,808.6
3,264.4
Stockholders’ equity
9,491.9
7,738.5
6,863.6
5,788.9
5,298.9
item 6 | selected financial data .
you should read the table below in conjunction with “ management ’ s discussion and analysis of financial condition and results of operations ” and our consolidated financial statements and related notes included in this annual report -amounts in millions except per share data .
-1 includes results from the acquisitions of foundry from april 18 2019 computerease from august 19 2019 ipipeline from august 22 2019 and bellefield from december 18 2019 ; and the results from the imaging businesses through disposal on february 5 2019 and gatan through disposal on october 29 2019 .
-2 includes results from the acquisitions of quote software from january 2 2018 planswift software from march 28 2018 smartbid from may 8 2018 powerplan inc .
from june 4 2018 conceptshare from june 7 2018 billblast from july 10 2018 and avitru from december 31 2018 .
-3 includes results from the acquisitions of phase technology from june 21 2017 handshake software inc .
from august 4 2017 workbook software a / s from september 15 2017 and onvia inc .
from november 17 2017 .
-4 includes results from the acquisitions of clinisys group ltd .
from january 7 2016 pci medical inc .
from march 17 2016 geneinsight inc .
from april 1 2016 isqft holdings inc .
-d / b / a constructconnect from october 31 2016 uniconnect lc from november 10 2016 and deltek inc .
from december 28 2016 .
-5 includes results from the acquisitions of strata decision technologies llc from january 21 2015 softwriters inc .
from february 9 2015 data innovations llc from march 4 2015 on center software llc from july 20 2015 rf ideas inc .
from september 1 2015 atlantic health partners llc from september 4 2015 aderant holdings inc .
from october 21 2015 atlas database software corp .
from october 26 2015 ; and the results from the black diamond advanced technologies through disposal on march 20 2015 and abel pumps through disposal on october 2 2015 .
-6 the company recognized an after tax gain of $ 687 .
3 in connection with the dispositions of the imaging businesses and gatan during 2019 .
the tax cuts and jobs act of 2017 - “ the tax act ” was signed into u .
s .
law on december 22 2017 which was prior to the end of the company ’ s 2017 reporting period and resulted in a one-time net income tax benefit of $ 215 .
4 .
-7 net working capital equals current assets excluding cash less total current liabilities excluding debt .
-8 in 2019 working capital includes the impact of the increase in income taxes payable of approximately $ 200 .
0 due to the taxes incurred on the gain on sale of gatan and the adoption of accounting standards codification - “ asc ” topic 842 leases - “ asc 842 ” which resulted in an increase to current liabilities of $ 56 .
8 as of december 31 2019 .
the other balance sheet accounts impacted due to the adoption of asc 842 are set forth in note 16 of the notes to consolidated financial statements included in this annual report .

Question: What is the percentage change in cash and cash equivalents in 2018 compared to 2015?
Answer: -53.19