How to assign values to an array of objects in Delphi - arrays

Question

I have an array of TBoek and and a loop that is supposed to assign values to each of the elements of the array. What happens instead is that the array ends up with the exact same values in each index. Perhaps my order of processing is incorrect or I'm incorrectly assigning values to the array, but either way I cannot for the life of me figure it out.
procedure TBoek.MaakArray;
var
i: integer;
sTitel, sOuteur, sISBN, sUitgewer, sPrys, sI: string;
boek: TBoek;
begin
boek := TBoek.Create;
for i := 0 to 9 do
begin
{$REGION 'Parse JSON om eienskappe van boek te kry'}
sI := IntToStr(i);
sTitel := JSONFile.GetValue<string>('items[' + sI + '].volumeInfo.title');
try
sOuteur := JSONFile.GetValue<string>
('items[' + sI + '].volumeInfo.authors[0]');
except
sOuteur := '<none>'
end;
try
sISBN := JSONFile.GetValue<string>
('items[' + sI + '].volumeInfo.industryIdentifiers[1].identifier');
except
sISBN := '<none>'
end;
try
sUitgewer := JSONFile.GetValue<string>
('items[' + sI + '].volumeInfo.publisher');
except
sUitgewer := '<none>'
end;
try
sPrys := JSONFile.GetValue<string>
('items[' + sI + '].saleInfo.listPrice.amount');
except
sPrys := '0';
end;
{$ENDREGION}
arrBoeke[i] := boek;
with arrBoeke[i] do
begin
SetTitel(sTitel);
SetOuteur(sOuteur);
SetISBN(sISBN);
SetUitgewer(sUitgewer);
SetPrys(sPrys);
end;
end;///end of for loop
end;
The Set functions all follow this format:
procedure TBoek.SetTitel(BoekTitel: string);
begin
fTitel := BoekTitel;
end;
This is the GetString function:
function TBoek.GetString: string;
begin
Result := GetTitel + #13#10 + GetOuteur + #13#10 + GetISBN + #13#10 +
GetUitgewer + #13#10 + GetPrys + #13#10 + #13#10;
end;
And the GetTitel,GetOuteur etc. functions all follow the same format:
function TBoek.GetTitel: string;
begin
Result := fTitel;
end;
What I want is to call:
for I := 0 to 9 do
begin
ShowMessage(arrBoeke[i].GetString);
end;
and access the values in the array one at a time, instead each value is the same.