These numbers are available to anybody who wishes to take the time and tally them up.
You can do this at Ceta-Base.org.
The deaths of 21 orcas since 1992 is troublesome enough but the numbers of dolphin and beluga whales death are even worse:
All told, since 1995, SeaWorld has lost 149 dolphins and beluga whales — almost 150 animals in just 21 years plus 21 orcas in 24 years. This is a number that nobody who claims to care for these animals can, or should, justify.
Too many deaths. Way too many. And these are fully conscious, highly intelligent animals. Why is there not more outrage toward SeaWorld?