cgmhi also has substantial borrowing arrangements consisting of facilities that cgmhi has been advised are available , but where no contractual lending obligation exists . these arrangements are reviewed on an ongoing basis to ensure flexibility in meeting cgmhi 2019s short-term requirements . the company issues both fixed and variable rate debt in a range of currencies . it uses derivative contracts , primarily interest rate swaps , to effectively convert a portion of its fixed rate debt to variable rate debt and variable rate debt to fixed rate debt . the maturity structure of the derivatives generally corresponds to the maturity structure of the debt being hedged . in addition , the company uses other derivative contracts to manage the foreign exchange impact of certain debt issuances . at december 31 , 2008 , the company 2019s overall weighted average interest rate for long-term debt was 3.83% ( 3.83 % ) on a contractual basis and 4.19% ( 4.19 % ) including the effects of derivative contracts . aggregate annual maturities of long-term debt obligations ( based on final maturity dates ) including trust preferred securities are as follows : in millions of dollars 2009 2010 2011 2012 2013 thereafter .

2009: citigroup parent company: 13463
other citigroup subsidiaries: 55853
citigroup global markets holdings inc .: 1524
citigroup funding inc .: 17632
total: 88472
2010: citigroup parent company: 17500
other citigroup subsidiaries: 16198
citigroup global markets holdings inc .: 2352
citigroup funding inc .: 5381
total: 41431
2011: citigroup parent company: 19864
other citigroup subsidiaries: 18607
citigroup global markets holdings inc .: 1487
citigroup funding inc .: 2154
total: 42112
2012: citigroup parent company: 21135
other citigroup subsidiaries: 2718
citigroup global markets holdings inc .: 2893
citigroup funding inc .: 1253
total: 27999
2013: citigroup parent company: 17525
other citigroup subsidiaries: 4248
citigroup global markets holdings inc .: 392
citigroup funding inc .: 3790
total: 25955
thereafter: citigroup parent company: 102794
other citigroup subsidiaries: 11691
citigroup global markets holdings inc .: 11975
citigroup funding inc .: 7164
total: 133624

long-term debt at december 31 , 2008 and december 31 , 2007 includes $ 24060 million and $ 23756 million , respectively , of junior subordinated debt . the company formed statutory business trusts under the laws of the state of delaware . the trusts exist for the exclusive purposes of ( i ) issuing trust securities representing undivided beneficial interests in the assets of the trust ; ( ii ) investing the gross proceeds of the trust securities in junior subordinated deferrable interest debentures ( subordinated debentures ) of its parent ; and ( iii ) engaging in only those activities necessary or incidental thereto . upon approval from the federal reserve , citigroup has the right to redeem these securities . citigroup has contractually agreed not to redeem or purchase ( i ) the 6.50% ( 6.50 % ) enhanced trust preferred securities of citigroup capital xv before september 15 , 2056 , ( ii ) the 6.45% ( 6.45 % ) enhanced trust preferred securities of citigroup capital xvi before december 31 , 2046 , ( iii ) the 6.35% ( 6.35 % ) enhanced trust preferred securities of citigroup capital xvii before march 15 , 2057 , ( iv ) the 6.829% ( 6.829 % ) fixed rate/floating rate enhanced trust preferred securities of citigroup capital xviii before june 28 , 2047 , ( v ) the 7.250% ( 7.250 % ) enhanced trust preferred securities of citigroup capital xix before august 15 , 2047 , ( vi ) the 7.875% ( 7.875 % ) enhanced trust preferred securities of citigroup capital xx before december 15 , 2067 , and ( vii ) the 8.300% ( 8.300 % ) fixed rate/floating rate enhanced trust preferred securities of citigroup capital xxi before december 21 , 2067 unless certain conditions , described in exhibit 4.03 to citigroup 2019s current report on form 8-k filed on september 18 , 2006 , in exhibit 4.02 to citigroup 2019s current report on form 8-k filed on november 28 , 2006 , in exhibit 4.02 to citigroup 2019s current report on form 8-k filed on march 8 , 2007 , in exhibit 4.02 to citigroup 2019s current report on form 8-k filed on july 2 , 2007 , in exhibit 4.02 to citigroup 2019s current report on form 8-k filed on august 17 , 2007 , in exhibit 4.2 to citigroup 2019s current report on form 8-k filed on november 27 , 2007 , and in exhibit 4.2 to citigroup 2019s current report on form 8-k filed on december 21 , 2007 , respectively , are met . these agreements are for the benefit of the holders of citigroup 2019s 6.00% ( 6.00 % ) junior subordinated deferrable interest debentures due 2034 . citigroup owns all of the voting securities of these subsidiary trusts . these subsidiary trusts have no assets , operations , revenues or cash flows other than those related to the issuance , administration and repayment of the subsidiary trusts and the subsidiary trusts 2019 common securities . these subsidiary trusts 2019 obligations are fully and unconditionally guaranteed by citigroup. .

Questions:
in 2009, what percentage of the total due aggregate annual maturities of long-term debt obligations ( based on final maturity dates ), including trust preferred securities, were related to citigroup funding inc .?
and three years later, in 2012, what were those total aggregate annual maturities of long-term debt obligations?
what were they in 2011?
what was, then, the change over the year?
and what is this change as a percentage of those 2011 obligations?

Answers:
20%
27999
42112
-14113
-33.5%