restrictive covenants the terms of the 2017 credit facility and certain of our senior unsecured notes include certain restrictions and covenants which may limit , among other things , our ability to pay dividends , make certain types of investments , incur additional indebtedness , incur liens and enter into negative pledge agreements and dispose of assets , and which require compliance with financial ratios relating to the maximum ratio of total indebtedness to total asset value , a minimum ratio of ebitda to fixed charges , a maximum ratio of secured indebtedness to total asset value and a maximum ratio of unsecured indebtedness to unencumbered asset value .
the dividend restriction referred to above provides that , we will not during any time when a default is continuing , make distributions with respect to common stock or other equity interests , except to enable the company to continue to qualify as a reit for federal income tax purposes .
as of december a031 , 2017 and 2016 , we were in compliance with all such covenants .
junior subordinated deferrable interest debentures in june a02005 , the company and the operating partnership issued $ 100.0 a0million in unsecured trust preferred securities through a newly formed trust , sl a0green capital trust i , or the trust , which is a wholly-owned subsidiary of the operating partnership .
the securities mature in 2035 and bear interest at a floating rate of 125 a0basis points over the three-month libor .
interest payments may be deferred for a period of up to eight consecutive quarters if the operating partnership exercises its right to defer such payments .
the trust preferred securities are redeemable at the option of the operating partnership , in whole or in part , with no prepayment premium .
we do not consolidate the trust even though it is a variable interest entity as we are not the primary beneficiary .
because the trust is not consolidated , we have recorded the debt on our consolidated balance sheets and the related payments are classified as interest expense .
interest rate risk we are exposed to changes in interest rates primarily from our variable rate debt .
our exposure to interest rate fluctuations are managed through either the use of interest rate derivative instru- ments and/or through our variable rate debt and preferred equity investments .
a hypothetical 100 a0basis point increase in interest rates along the entire interest rate curve for a02017 would increase our consolidated annual interest cost , net of interest income from variable rate debt and preferred equity investments , by $ 2.7 a0mil- lion and would increase our share of joint venture annual interest cost by $ 17.2 a0million .
at december a031 , 2017 , 61.5% ( 61.5 % ) of our $ 2.1 a0bil- lion debt and preferred equity portfolio is indexed to libor .
we recognize most derivatives on the balance sheet at fair value .
derivatives that are not hedges are adjusted to fair value through income .
if a derivative is considered a hedge , depending on the nature of the hedge , changes in the fair value of the derivative will either be offset against the change in fair value of the hedged asset , liability , or firm commitment through earnings , or recog- nized in other comprehensive income until the hedged item is recognized in earnings .
the ineffective portion of a derivative 2019s change in fair value is immediately recognized in a0earnings .
our long-term debt of $ 4.3 a0billion bears interest at fixed rates , and therefore the fair value of these instruments is affected by changes in the market interest rates .
our variable rate debt and variable rate joint venture debt as of december a031 , 2017 bore interest based on a spread of libor plus 100 a0basis points to libor plus 415 a0basis points .
contractual obligations the combined aggregate principal maturities of mortgages and other loans payable , the 2017 credit facility , senior unsecured notes ( net of discount ) , trust preferred securities , our share of joint venture debt , including as-of-right extension options and put options , estimated interest expense , and our obligations under our capital lease and ground leases , as of december a031 , 2017 are as follows ( in a0thousands ) : .

2018
2019
2020
2021
2022
Thereafter
Total
Property mortgages and other loans
$153,593
$42,289
$703,018
$11,656
$208,003
$1,656,623
$2,775,182
MRA facilities
90,809
—
—
—
—
—
90,809
Revolving credit facility
—
—
—
—
—
40,000
40,000
Unsecured term loans
—
—
—
—
—
1,500,000
1,500,000
Senior unsecured notes
250,000
—
250,000
—
800,000
100,000
1,400,000
Trust preferred securities
—
—
—
—
—
100,000
100,000
Capital lease
2,387
2,411
2,620
2,794
2,794
819,894
832,900
Ground leases
31,049
31,066
31,436
31,628
29,472
703,254
857,905
Estimated interest expense
226,815
218,019
184,376
163,648
155,398
281,694
1,229,950
Joint venture debt
200,250
717,682
473,809
449,740
223,330
2,119,481
4,184,292
Total
$954,903
$1,011,467
$1,645,259
$659,466
$1,418,997
$7,320,946
$13,011,038

.

Question: Analyse this data from a financial earnings document. what was the 2019 rate of decrease in estimated interest expense payments?
Choices:
2.65359
8796
0.04035
0.00004
0.03878
Correct choice index: 4