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my $string = '1,3,5,7,9,1,3,4,5,6,2,1,5,6,7,9';

...
   my $count = () = ",$string," =~ /,$num(?=,)/g;
   print "$num\t$count\n";
}

1       3
2       1
...
7       2
8       0
9       2

my $string = '1,3,5,7,9,1,3,4,5,6,2,1,5,6,7,9';

...
for my $num (sort { $a <=> $b } keys %counts) {
   print "$num\t$counts{$num}\n";
}

1       3
2       1
...
6       2
7       2
9       2