A balance was set by root.
Some amount was deposited (e.g. for transaction fees).
An account was removed whose balance was non-zero but below ExistentialDeposit,
resulting in an outright loss.
An account was created with some free balance.
Some balance was moved from the reserve of the first account to the second account.
Final argument indicates the destination balance type.
Some balance was reserved (moved from free to reserved).
Some amount was removed from the account (e.g. for misbehavior).
Transfer succeeded.
Some balance was unreserved (moved from reserved to free).
Some amount was withdrawn from the account (e.g. for transaction fees).