It was modified .
It was renamed to the Henley Passport Index ( HPI ) on 9 January 2018 and continues to provide a ranking of the 199 passports of the world according to the number of countries their holders can travel to visa - free .
It was modified and renamed to the Henley Passport Index ( HPI ) on 9 January 2018 and continues to provide a ranking of the 199 passports of the world according to the number of countries their holders can travel to visa - free .