There are various statistics estimating mortality of COVID-19 infections, based on how many diagnosed people have died. These numbers are used by various media to extrapolate how many people will die if the disease spreads uncontrollably.
However, what is missing here are the undiagnosed infected (due to their immune system fighting the virus fast enough and thus only presenting with mild, or no, symptoms).
Do we have any data or estimates for the percentage of infected people that are asymptomatic?