Was wondering if you can give me an approximate percentage of...

Was wondering if you can give me an approximate percentage of the amount of times theives cut telephone lines before breaking in.
As for our alarms being useless, the siren has always made the theives work pretty quickly and with all our breakins, a security company would never have been quick enough to catch them, and as I'm sure you are wondering, our telephone lines have never been cut yet. So, the SAS alarm module would have served us absolutely no benefit.
(NB I am a shareholder or outright owner of around 50 health care premises in WA and Victoria and I am shareholder in 2 shopping local shopping centre complexes.)