How can I count No. of times splunk has been restarted?

[sjaitly]

I'm trying to create a dashboard that displays the data for splunk restart 
the current search I'm using is index="_audit"  
but this shows the no. of times I've logged in instead of the no. of times I've restarted

[richgalloway]

You'll find restarts with this query

index=_internal sourcetype=splunkd "Splunkd starting"