Here is the table showing the US statistics: http://pdfs.thoroughbreddailynews.com/generic_upload/pdf/supplementaltables_eid.pdf
As you can see the stats in the US are:
2011
Turf 1.53 per 1000 starts
Dirt 2.07 per 1000 starts
Synthetic 1.09 per 1000 starts
This compares to the UK figure of 0.6 per 1000 starts (Turf and Synthetic combined) and 4 per 1000 for jumps, giving an average of around 2 per 1000.
(Graph here: http://www.britishhorseracing.com/resources/equine-science-and-welfare/FatalitiesGraphLarge2011.jpg)
As you can see the stats in the US are:
2011
Turf 1.53 per 1000 starts
Dirt 2.07 per 1000 starts
Synthetic 1.09 per 1000 starts
This compares to the UK figure of 0.6 per 1000 starts (Turf and Synthetic combined) and 4 per 1000 for jumps, giving an average of around 2 per 1000.
(Graph here: http://www.britishhorseracing.com/resources/equine-science-and-welfare/FatalitiesGraphLarge2011.jpg)