 If Antarctica is also excluded, then population density rises to over 55 people per km2 (over 142 per sq. mi.).
<coherence>  If Antarctica is also excluded, then population density rises to over 55 people per km2 (over 142 per sq. mi.).
 Furthermore, if Antarctica is also excluded, then population density rises to over 55 people per km2 (over 142 per sq. mi.).