united parcel service , inc .
and subsidiaries notes to consolidated financial statements floating-rate senior notes the floating-rate senior notes with principal amounts totaling $ 1.043 billion , bear interest at either one or three-month libor , less a spread ranging from 30 to 45 basis points .
the average interest rate for 2017 and 2016 was 0.74% ( 0.74 % ) and 0.21% ( 0.21 % ) , respectively .
these notes are callable at various times after 30 years at a stated percentage of par value , and putable by the note holders at various times after one year at a stated percentage of par value .
the notes have maturities ranging from 2049 through 2067 .
we classified the floating-rate senior notes that are putable by the note holder as a long-term liability , due to our intent and ability to refinance the debt if the put option is exercised by the note holder .
in march and november 2017 , we issued floating-rate senior notes in the principal amounts of $ 147 and $ 64 million , respectively , which are included in the $ 1.043 billion floating-rate senior notes described above .
these notes will bear interest at three-month libor less 30 and 35 basis points , respectively and mature in 2067 .
the remaining three floating-rate senior notes in the principal amounts of $ 350 , $ 400 and $ 500 million , bear interest at three-month libor , plus a spread ranging from 15 to 45 basis points .
the average interest rate for 2017 and 2016 was 0.50% ( 0.50 % ) and 0.0% ( 0.0 % ) , respectively .
these notes are not callable .
the notes have maturities ranging from 2021 through 2023 .
we classified the floating-rate senior notes that are putable by the note holder as a long-term liability , due to our intent and ability to refinance the debt if the put option is exercised by the note holder .
capital lease obligations we have certain property , plant and equipment subject to capital leases .
some of the obligations associated with these capital leases have been legally defeased .
the recorded value of our property , plant and equipment subject to capital leases is as follows as of december 31 ( in millions ) : .

2017
2016
Vehicles
$70
$68
Aircraft
2,291
2,291
Buildings
285
190
Accumulated amortization
(990)
(896)
Property, plant and equipment subject to capital leases
$1,656
$1,653

these capital lease obligations have principal payments due at various dates from 2018 through 3005 .
facility notes and bonds we have entered into agreements with certain municipalities to finance the construction of , or improvements to , facilities that support our u.s .
domestic package and supply chain & freight operations in the united states .
these facilities are located around airport properties in louisville , kentucky ; dallas , texas ; and philadelphia , pennsylvania .
under these arrangements , we enter into a lease or loan agreement that covers the debt service obligations on the bonds issued by the municipalities , as follows : 2022 bonds with a principal balance of $ 149 million issued by the louisville regional airport authority associated with our worldport facility in louisville , kentucky .
the bonds , which are due in january 2029 , bear interest at a variable rate , and the average interest rates for 2017 and 2016 were 0.83% ( 0.83 % ) and 0.37% ( 0.37 % ) , respectively .
2022 bonds with a principal balance of $ 42 million and due in november 2036 issued by the louisville regional airport authority associated with our air freight facility in louisville , kentucky .
the bonds bear interest at a variable rate , and the average interest rates for 2017 and 2016 were 0.80% ( 0.80 % ) and 0.36% ( 0.36 % ) , respectively .
2022 bonds with a principal balance of $ 29 million issued by the dallas / fort worth international airport facility improvement corporation associated with our dallas , texas airport facilities .
the bonds are due in may 2032 and bear interest at a variable rate , however the variable cash flows on the obligation have been swapped to a fixed 5.11% ( 5.11 % ) .
2022 in september 2015 , we entered into an agreement with the delaware county , pennsylvania industrial development authority , associated with our philadelphia , pennsylvania airport facilities , for bonds issued with a principal balance of $ 100 million .
these bonds , which are due september 2045 , bear interest at a variable rate .
the average interest rate for 2017 and 2016 was 0.78% ( 0.78 % ) and 0.40% ( 0.40 % ) , respectively. .

Question: Analyse this data from a financial earnings document. what was the change in millions of vehicles from 2016 to 2017?
Choices:
2.0
32
-498
-2
2000
Correct choice index: 0