Table:
2019	2018	Change

Personnel costs, including teammate benefits	$684,837	$593,955	$90,882

Depreciation and amortization	46,209	37,458	8,751

Facility expenses	30,945	26,396	4,549

Travel and entertainment	28,402	25,656	2,746

Legal and professional fees	16,839	16,103	736

Marketing	11,597	10,345	1,252

Other	61,908	46,616	15,292

Total	$880,737	$756,529	$124,208

Answer the following question leveraging the table plus the background text, feel free to explain how you reached the answer, then present the result in JSON format {"answer": ["ANSWER"], "scale": "SCALE"} (leave scale empty if none).

Supporting text:
Selling and Administrative Expenses. Selling and administrative expenses increased $124.2 million in 2019 compared to 2018. Our selling and administrative expenses by major expense type for 2019 and 2018 were as follows (dollars in thousands):
Selling and administrative expenses increased approximately 70 basis points as a percentage of net sales in 2019 compared to 2018. The increase in expenses reflects the addition of PCM to our North America and EMEA segments, effective August 30, 2019.
The addition of PCM and increased variable compensation resulting from increased sales and gross profit in 2019 compared to 2018 were the primary drivers for the $90.9 million increase in personnel costs. PCM was also the primary driver for year over year increases in facilities, travel and entertainment, and marketing expenses.
Depreciation and amortization expense increased approximately $8.8 million year over year, primarily due to additional amortization expense on newly acquired intangible assets.

Question: What is the average Personnel costs, including teammate benefits for 2018 and 2019?

(684,837+593,955) / 2, therefore {"answer": "639396", "scale": "thousand"}