I don't have a clue but I'm guessing 90% to high 90%'s hold fractional amounts of bitcoin.
So if that is the case, surmising when they bought and when they sold is shear speculation on anyone's part.
Local wallets are designed to have many addresses and each address to contain small amounts
People who say "most addresses only hold small amounts 0.xx" do not understand concepts of inputs, outputs and change addresses
They also do not know about best practice of avoiding address re-use for safety and privacy of everyone (obfuscation of identities)
Every bitcoin wallet will generate a new address when you wish to receive bitcoins
Here's list of many addresses and balances of each address
I actually had a lot more small balance amounts addresses (due to change addresses), but my OCD wants to clear them out once in a while
