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        for my $size (@sizeOfTrees) {
            my $quant = $tree_collection{$years}{$trees}{$size} || "-"
+;
...

            # { no warnings; $total += $quant; }    # WHY DO I NEED TH
+IS?
        }

        for my $size (@sizeOfTrees) {
            my $quant = $tree_collection{$years}{$trees}{$size} || 0;
...

            $total += $quant;
        }

my $quantity        = ();
my $total_quantity  = ();

    my $total      = ();
    my $year_total = ();

            printf "%9s", "$quant";
        printf "%5s", "$total";
        printf "%9s", "$total_col{$i}";
    printf "%5s", "$year_total";