American EV giant Tesla Inc (NASDAQ:TSLA) reportedly witnessed 16,200 insurance registrations in China last week, marking a jump of 12.5% from the week before, and its third-highest weekly registrations this year, despite increased competition from domestic automakers. What Happened: For the week of September 2-8, Tesla saw its highest weekly insurance registrations since the third week of June when it witnessed 17,400 registrations, CnEVPost reported. Insurance registrations in China are considered a proxy for sales. For the month of August, Tesla sold 63,456 vehicles in China, marking its be…