united parcel service , inc .
and subsidiaries notes to consolidated financial statements 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 ) : .

2015
2014
Vehicles
$74
$86
Aircraft
2,289
2,289
Buildings
207
197
Accumulated amortization
(849)
(781)
Property, plant and equipment subject to capital leases
$1,721
$1,791

these capital lease obligations have principal payments due at various dates from 2016 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 2015 and 2014 were 0.03% ( 0.03 % ) and 0.05% ( 0.05 % ) , 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 2015 and 2014 were 0.02% ( 0.02 % ) and 0.05% ( 0.05 % ) , 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 bonds with a principal balance of $ 100 million issued by the delaware county , pennsylvania industrial development authority associated with our philadelphia , pennsylvania airport facilities .
the bonds , which were due in december 2015 , had a variable interest rate , and the average interest rates for 2015 and 2014 were 0.02% ( 0.02 % ) and 0.04% ( 0.04 % ) , respectively .
as of december 2015 , these $ 100 million bonds were repaid in full .
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 2015 was 0.00% ( 0.00 % ) .
pound sterling notes the pound sterling notes consist of two separate tranches , as follows : 2022 notes with a principal amount of a366 million accrue interest at a 5.50% ( 5.50 % ) fixed rate , and are due in february 2031 .
these notes are not callable .
2022 notes with a principal amount of a3455 million accrue interest at a 5.125% ( 5.125 % ) fixed rate , and are due in february 2050 .
these notes are callable at our option at a redemption price equal to the greater of 100% ( 100 % ) of the principal amount and accrued interest , or the sum of the present values of the remaining scheduled payout of principal and interest thereon discounted to the date of redemption at a benchmark u.k .
government bond yield plus 15 basis points and accrued interest. .

Question: Analyse this data from a financial earnings document. what was the change in millions of vehicles from 2014 to 2015?
Choices:
0
14
-12.0
74
12
Correct choice index: 2