How can you sort the values of a Hash numerically?

#!/usr/bin/perl
   
%FM = ( 'Radio City' => '91.1',
              'Big FM' => '92.7',
              'Red FM' => '93.5',
              'Radio One' => '94.3',
              'Radio Mirchi' => '98.3',
              'Fever' => '104.0',
              'Oye FM' => '104.8',
              'FM Rainbow' => '107.1',
              'FM Gold' => '100.7');

foreach $station (sort { $FM {$a} <=> $FM {$b}} keys %FM )
{
        print "$station is $FM{$station} MHz.\n";
}