Table:
|  |  | Year Ended March 31, |  |
| --- | --- | --- | --- |
|  | 2019 | 2018 | 2017 |
|  |  | (In thousands) |  |
| Unrecognized tax benefits, beginning of period | $2,735 | $2,714 | $2,055 |
| Additions based on tax positions related to current year | 371 | 520 | 730 |
| Additions based on tax positions related to prior years | 13 | — | — |
| 2017 Tax Act and tax rate re-measurement | — | (499) | — |
| Reductions based on tax positions related to prior years | (17) | — | — |
| Lapses during the current year applicable to statutes of limitations | — | — | (71) |
| Unrecognized tax benefits, end of period | $3,102 | $2,735 | $2,714 |
Paragraphs:
The long-term portion of the Company’s unrecognized tax benefits at March 31, 2019 and 2018 was $622,000 and $619,000, respectively, of which the timing of the resolution is uncertain. As of March 31, 2019 and 2018, $2.5 million and $2.1 million, respectively, of unrecognized tax benefits had been recorded as a reduction to net deferred tax assets.
As of March 31, 2019, the Company’s net deferred tax assets of $6.7 million are subject to a valuation allowance of $6.7 million. It is possible, however, that some months or years may elapse before an uncertain position for which the Company has established a reserve is resolved. A reconciliation of unrecognized tax benefits is as follows:
The unrecognized tax benefit balance as of March 31, 2019 of $599,000 would affect the Company’s effective tax rate if recognized.
Question:
What is the average Additions based on tax positions related to prior years between 2017-2019?
Answer: (13 + 0 + 0) / 3 = 4.33