table of contents item 2 .
properties .
the following table summarizes the facilities we lease as of december 31 , 2017 , including the location and size of each principal facility , and their designated use .
we believe our facilities are adequate for our current and near-term needs , and will be able to locate additional facilities as needed .
location approximate square feet operation expiration dates .

Location
Approximate Square Feet
Operation
LeaseExpiration Dates
San Diego, CA
1,218,000
R&D, Manufacturing, Warehouse, Distribution, and Administrative
2018 – 2031
San Francisco Bay Area, CA
616,000
R&D, Manufacturing, Warehouse, and Administrative
2018 – 2025
Singapore
395,000
R&D, Manufacturing, Warehouse, Distribution, and Administrative
2018 – 2025
Cambridge, United Kingdom*
92,000
R&D, Manufacturing, and Administrative
2020 – 2024
Eindhoven, the Netherlands
42,000
Distribution and Administrative
2020
Madison, WI*
73,000
R&D, Manufacturing, Warehouse, Distribution, and Administrative
2018 – 2019
Other*
78,000
Administrative
2018 – 2022

________________ *excludes approximately 309000 square feet for which the leases do not commence until 2018 and beyond .
item 3 .
legal proceedings .
we are involved in various lawsuits and claims arising in the ordinary course of business , including actions with respect to intellectual property , employment , and contractual matters .
in connection with these matters , we assess , on a regular basis , the probability and range of possible loss based on the developments in these matters .
a liability is recorded in the financial statements if it is believed to be probable that a loss has been incurred and the amount of the loss can be reasonably estimated .
because litigation is inherently unpredictable and unfavorable results could occur , assessing contingencies is highly subjective and requires judgments about future events .
we regularly review outstanding legal matters to determine the adequacy of the liabilities accrued and related disclosures .
the amount of ultimate loss may differ from these estimates .
each matter presents its own unique circumstances , and prior litigation does not necessarily provide a reliable basis on which to predict the outcome , or range of outcomes , in any individual proceeding .
because of the uncertainties related to the occurrence , amount , and range of loss on any pending litigation or claim , we are currently unable to predict their ultimate outcome , and , with respect to any pending litigation or claim where no liability has been accrued , to make a meaningful estimate of the reasonably possible loss or range of loss that could result from an unfavorable outcome .
in the event opposing litigants in outstanding litigations or claims ultimately succeed at trial and any subsequent appeals on their claims , any potential loss or charges in excess of any established accruals , individually or in the aggregate , could have a material adverse effect on our business , financial condition , results of operations , and/or cash flows in the period in which the unfavorable outcome occurs or becomes probable , and potentially in future periods .
item 4 .
mine safety disclosures .
not applicable. .

Question: Analyse this data from a financial earnings document. in madison wi what was the ratio of the square feet excluded for which the leases do not commence until 2018 as of december 31 , 2017
Choices:
1
4.23288
0.23625
22557000000
3.3587
Correct choice index: 1