how to save looping data ?

how to save looping data, I have data that consists of 6 years, I process using for-end. but I have trouble storing each data in the form of year_2014 to year_2019.

fileList1 = getAllFiles('D:\MATLAB\change\data maximu\*.xls');
[nn, mm] = size(fileList1);  
for jj= 1:nn;
   jj;
fname=fileList1{jj} ;
FILE_NAME = sprintf('%s%s',fname(1:29),fname(36:end));
[data, txt,all]   = xlsread(FILE_NAME);
.
.
.
.
year_2014 = [ ]
dlmwrite('year_2014.txt',year_2014, 'delimiter', '\t', 'precision', 8, '-append')
end

and only one year is saved, thank you for the advice given to my program thank you

Answer 1

[KALYAN ACHARJYA]

data_file=cell(1,nn);
for jj= 1:nn;
 %......
[data, txt,all]   = xlsread(FILE_NAME);
%...........^ change this variable name, check @Madhan's comment
data_file{ii}=data
%.....
end

[madhan ravi]

Don't use all as a variable name , will hinder the inbuilt function all() .