use strict;
use warnings;

use Locale::Country;
my @names = all_country_names();

# Better use Regexp::Trie
my $countries_re = do {
    local $" = q{|};
    qr/@{[map quotemeta, @names]}/i;
};

my %hash;
while (<>) {
    #if (/^.*?-([A-Z][A-Za-z\s\-]+[a-z])\s+(\d+)\s+hops?\b/is) {
    if (/^.*?-($countries_re)\s+(\d+)\s+hops?\b/is) {
        my ($country, $hops) = ($1, $2);
        $hash{$country} = {
                           sum => ($hash{$country}{sum} || 0) + $hops,
                           num => ++$hash{$country}{num}
                          };
    }
}

foreach my $key (sort keys %hash) {
    printf "$key avg: %.3f\n", $hash{$key}{sum} / $hash{$key}{num};
}

__END__
Australia avg: 30.000
China avg: 22.667
Czech Republic avg: 19.500
France avg: 30.000
Germany avg: 8.500
Japan avg: 18.000
Netherlands avg: 9.500
United Kingdom avg: 8.000
United States avg: 19.667