BuzzSumo reports that most posts (median) in 2017 were shared 4 times. That's down from 8 in 2015.
To be in the top 1%, your article needed to be shared 2,406 times or more.
Top 5%, 343 shares or more.
Top 10%, 62 shares or more.
So 90% of content is shared less than 62 times.
There's more content. Attention is more scarce.
Facebook has put the brakes on.
People are sharing in other ways, mostly using social messaging apps WhatsApp, Messenger, WeChat and Viber. Data suggests shares here are twice as high as public shares.
If your shares have bucked this trend, you're doing alright.