Day one: 33 runners over hurdles – two fallers
Day two: 45 runners over hurdles – two fallers (one fatal)
Day three: 63 runners over hurdles – one faller
That’s 141 runners and five fallers, which is roughly 3,5%.
Three fallers had SPs of 66/1, 100/1 and 250/1 which might reflect their ability a bit.
The ground was on the fast side and no significant errors or even injuries after an error were recorded.
I don’t think you can get better numbers despite the fact that Constitution Hill won’t agree.