In its preliminary fourth quarter and financial year 2013 results, ship owners and charterers Navigator Holdings report that EBITDA increased to $106.8 million for the year ended December 31, 2013 from $63.9 million for 2012. Operating revenue for the year ended December 31, 2013 amounted to $234.3 million (excluding the cargo revenue mentioned above), an increase of $87.6 million compared to operating revenue of $146.7 million for the year ended December 31, 2012. Net operating revenue…