US electric car manufacturer Tesla last quarter recorded its first drop in sales in nearly four years. Total revenue fell by 9% year-on-year to $21.3 billion, the manufacturer announced after the US stock exchange closed on Tuesday. Analysts had expected an average turnover of $22.15 billion. Tesla’s earnings per share were also below market expectations. On balance, the net income attributable to common stockholders in the quarter fell by 55% to $1.13 billion. The decline became apparent after Tesla earlier this month announced it missed expectations with deliveries of around 387,000 vehicles…