The average piece of code is written once and read hundreds to thousands of times by people I've seen this truism before but I never seen any actual data on th

The average piece of code is written once and read hundreds to thousands of times by people I've seen this truism before but I never seen any actual data on this. Do you have any sources for this? My intuition says most code is Enterprise/small business code that is written once and read less than 10 times.