There is an article on nature dot com that shares some data. Can't post the link because the system thinks that it is spam.
This article says that there was a case mortality rate of 1.1% and that 18% of cases reported no symptoms whatsoever. Asymptomatic, mild and moderate cases are under-reported in numbers published by the government, inflating the mortality rate.
I don't know for sure, but I think that cruise ship populations tend to be skewed to older ages as well, which could mean that the true case mortality rate could be even lower than the 1.1% estimate. While a 1.1% mortality rate for COVID-19 may not seem very high, what is also worrisome is how quickly it spreads. The seasonal flu is estimated to have a mortality rate of 0.1%. Therefore, combined with how quickly COVID-19 spreads, we could see the number of deaths from this disease to be anywhere from 20x to maybe 200x that of the seasonal flu.