How widespread is learned-helplessness in society? Looking at these resources:

Wikipedia, Learned helplessness
Christopher Peterson, Learned Helplessness, 2010
Mario Mikulincer, Human Learned Helplessness: A Coping Perspective, 2013

I'm still unable to find how widespread learned helplessness is in society. Do you know where I should take a look?
The problem with measuring learned helplessness is that while we know it exists and is related to  dorsal raphe nucleus 5-HT neurons in the brain, we have no official designation of it as a mental disorder and official study to measure it. However, there is a correlation between depression and learned helplessness, so we might be able to use depression statistics in order to measure the amount of learned helplessness in society. 7.6% of people 12 years and older experience depression in the United States in any two week period and 9.4% of American patients visiting the hospital in 2017 experienced depression. Globally, over 264 million people suffer from depression and thus, they are more likely to suffer from learned helplessness.