Indian passport ranks as low as 75 in global power index. Here's why

Singapore's passport has been announced as the most powerful in the world as it secured the top spot in the index' most powerful ranking with a visa-free score of 159

This article has been modified to rectify an error in an earlier version.

The Indian passport has fared poorly at the 75th position in a global ranking, which saw an Asian country, Singapore, ranking at first position for the first time. 

The Passport Index' Global Passport Power Rank 2017 ranks India, according to its passport's total visa-free score, below countries like Mali, Madagascar, Gabon, and Comoros, which all had a visa-free score of 52. India, according to the index, has a visa-free score of 51.  

But, how does the index, developed by global financial advisory firm Arton Capital,