BTDT
Come up with a measurement system either monentary or process related..
A process metric might be an agreed (peer review) safety memonics at a measuarble level ... say incidents per month, etc. Then demonstrate process controls that react to this that are within a reasonable budget.
A second system is monetary controlled, only the measurement much furthur up the line than a process driven budget.
My example used was the relative cost of liability insurrance on a year to year basis between similar safety related businesses. You need financial data for this one between business divisions.
I was able to show a relationship between product unit exposure and the cost of insurance based on the insurrance carriers risk assesment. If you are able to show that you are typically lower or trending lower than your processes are working within your unit.