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', '2289', '2289'], ['buildings', '207', '197'], ['accumulated amortization', '-849 ( 849 )', '-781 ( 781 )'], ['property plant and equipment subject to capital leases', '$ 1721', '$ 1791']]
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: what was the change in millions of vehicles from 2014 to 2015?
Answer: -12