You are now a sqlite data analyst, and you are given a database schema as follows:

    【Schema】
    【DB_ID】 world_development_indicators
【Schema】
# Table: Series
[
(SeriesCode:TEXT, Primary Key, Examples: [AG.AGR.TRAC.NO, AG.CON.FERT.PT.ZS, AG.CON.FERT.ZS]),
(Topic:TEXT),
(IndicatorName:TEXT),
(ShortDefinition:TEXT),
(LongDefinition:TEXT),
(UnitOfMeasure:TEXT, Examples: [`, %, 2005 PPP $]),
(Periodicity:TEXT, Examples: [Annual]),
(BasePeriod:TEXT, Examples: [2005, varies by country, 2011]),
(OtherNotes:INTEGER),
(AggregationMethod:TEXT, Examples: [Weighted average, Sum, Gap-filled total]),
(LimitationsAndExceptions:TEXT),
(NotesFromOriginalSource:TEXT),
(GeneralComments:TEXT),
(Source:TEXT),
(StatisticalConceptAndMethodology:TEXT),
(DevelopmentRelevance:TEXT),
(RelatedSourceLinks:TEXT),
(OtherWebLinks:INTEGER),
(RelatedIndicators:INTEGER),
(LicenseType:TEXT, Examples: [Open, Restricted])
]
# Table: Footnotes
[
(Countrycode:TEXT, Primary Key, Examples: [ABW, ADO, AFG]),
(Seriescode:TEXT, Primary Key, Examples: [AG.LND.FRST.K2, BX.KLT.DINV.CD.WD, DC.DAC.AUSL.CD]),
(Year:TEXT, Primary Key, Examples: [YR1990, YR2000, YR2005]),
(Description:TEXT)
]
# Table: Indicators
[
(CountryName:TEXT, Examples: [Arab World]),
(CountryCode:TEXT, Primary Key, Examples: [ABW, ADO, AFG]),
(IndicatorName:TEXT),
(IndicatorCode:TEXT, Primary Key, Examples: [AG.LND.AGRI.K2, AG.LND.AGRI.ZS, AG.LND.ARBL.HA]),
(Year:INTEGER, Primary Key, Examples: [1961, 1962, 1963]),
(Value:INTEGER, Examples: [133, 87, 6])
]
# Table: SeriesNotes
[
(Seriescode:TEXT, Primary Key, Examples: [DT.DOD.PVLX.CD, IC.CUS.DURS.EX, IC.FRM.BNKS.ZS]),
(Year:TEXT, Primary Key, Examples: [YR2014, YR2002, YR2003]),
(Description:TEXT)
]
# Table: Country
[
(CountryCode:TEXT, Primary Key, Examples: [ABW, ADO, AFG]),
(ShortName:TEXT, Examples: [Afghanistan, Albania, Algeria]),
(TableName:TEXT, Examples: [Afghanistan, Albania, Algeria]),
(LongName:TEXT, Examples: [Islamic State of Afghanistan]),
(Alpha2Code:TEXT, Examples: [AF, AL, DZ]),
(CurrencyUnit:TEXT, Examples: [Afghan afghani, Albanian lek, Algerian dinar]),
(SpecialNotes:TEXT),
(Region:TEXT, Examples: [South Asia]),
(IncomeGroup:TEXT, Examples: [Low income, Upper middle income, High income: nonOECD]),
(Wb2Code:TEXT, Examples: [AF, AL, DZ]),
(NationalAccountsBaseYear:TEXT, Examples: [2002/03]),
(NationalAccountsReferenceYear:TEXT, Examples: [1996, 2013/14, 2010]),
(SnaPriceValuation:TEXT, Examples: [Value added at basic prices (VAB)]),
(LendingCategory:TEXT, Examples: [IDA, IBRD, Blend]),
(OtherGroups:TEXT, Examples: [HIPC, Euro area]),
(SystemOfNationalAccounts:TEXT),
(AlternativeConversionFactor:TEXT, Examples: [199196, 197184, 199095]),
(PppSurveyYear:TEXT, Examples: [Rolling]),
(BalanceOfPaymentsManualInUse:TEXT, Examples: [IMF Balance of Payments Manual, 6th edition.]),
(ExternalDebtReportingStatus:TEXT, Examples: [Actual, Preliminary, Estimate]),
(SystemOfTrade:TEXT, Examples: [General trade system, Special trade system]),
(GovernmentAccountingConcept:TEXT, Examples: [Consolidated central government]),
(ImfDataDisseminationStandard:TEXT, Examples: [General Data Dissemination System (GDDS)]),
(LatestPopulationCensus:TEXT, Examples: [1979, 2011, 2008]),
(LatestHouseholdSurvey:TEXT, Examples: [Multiple Indicator Cluster Survey (MICS), 2010/11]),
(SourceOfMostRecentIncomeAndExpenditureData:TEXT),
(VitalRegistrationComplete:TEXT, Examples: [Yes]),
(LatestAgriculturalCensus:TEXT, Examples: [2013/14, 2012, 2007]),
(LatestIndustrialData:INTEGER, Examples: [2011, 2010, 2002]),
(LatestTradeData:INTEGER, Examples: [2013, 2006, 2012]),
(LatestWaterWithdrawalData:INTEGER, Examples: [2000, 2006, 2001])
]
# Table: CountryNotes
[
(Countrycode:TEXT, Primary Key, Examples: [ABW, ADO, AFG]),
(Seriescode:TEXT, Primary Key, Examples: [EG.EGY.PRIM.PP.KD, EG.ELC.RNEW.ZS, EG.FEC.RNEW.ZS]),
(Description:TEXT)
]
【Foreign keys】
Footnotes.Seriescode=Series.SeriesCode
Footnotes.Countrycode=Country.CountryCode
Indicators.CountryCode=Country.CountryCode
SeriesNotes.Seriescode=Series.SeriesCode
CountryNotes.Seriescode=Series.SeriesCode
CountryNotes.Countrycode=Country.CountryCode

    【Question】
    What is the average adolescent fertility rate of the country whose Alpha2Code is 1A over the years this indicator was calculated. the average adolescent fertility rate is DIVIDE(SUM(value), SUM(IndicatorName like 'adolescent fertility rate%'))

    【Evidence】
    the average adolescent fertility rate is DIVIDE(SUM(value), SUM(IndicatorName like 'adolescent fertility rate%'))

    Please read and understand the database schema carefully, and generate an executable SQL based on the user's question and evidence. 

SQL: SELECT AVG(T2.Value) FROM Country AS T1 INNER JOIN Indicators AS T2 ON T1.CountryCode = T2.Countrycode WHERE T1.Alpha2Code = '1A' AND T2.IndicatorName LIKE 'adolescent fertility rate%'