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You deal 18% of your team's damage to champions as ADC. Carries should be closer to 25%. Stay alive in fights by attacking whatever is closest instead of diving for the backline, and finish damage items before defensive ones.
You take part in 35% of your team's kills; Gold players average 53%. After your first item, look to rotate for dragon, grubs and herald, and keep Teleport for fights rather than for farming.
You spend 40% of your games dead. Late deaths cost a minute each; when a fight is lost, back off and defend rather than adding one more death to it.
