Table:
(In millions)

Year Ended June 30,	2019	2018	2017

Balance, beginning of period	$ 397	$ 361	$ 409

Charged to costs and other	153	134	58

Write-offs	(116)	(98)	(106)

Balance, end of period	$ 434	$ 397	$ 361

Answer the following question taking into account the tabular data along with the context text, respond with any necessary explanation, then provide the JSON object {"answer": ["ANSWER"], "scale": "SCALE"} as the final output (use an empty string for scale if irrelevant).

Context:
Contract Balances
Timing of revenue recognition may differ from the timing of invoicing to customers. We record a receivable when revenue is recognized prior to invoicing, or unearned revenue when revenue is recognized subsequent to invoicing. For multi-year agreements, we generally invoice customers annually at the beginning of each annual coverage period. We record a receivable related to revenue recognized for multi-year on-premises licenses as we have an unconditional right to invoice and receive payment in the future related to those licenses.
As of June 30, 2019 and 2018, long-term accounts receivable, net of allowance for doubtful accounts, was $2.2 billion and $1.8 billion, respectively, and is included in other long-term assets in our consolidated balance sheets.
The allowance for doubtful accounts reflects our best estimate of probable losses inherent in the accounts receivable balance. We determine the allowance based on known troubled accounts, historical experience, and other currently available evidence.
Activity in the allowance for doubtful accounts was as follows:

Question: What was the % change in the balance, beginning of the period from 2018 to 2019?

((397-361)/361) * 100, therefore {"answer": "9.97", "scale": "percent"}