Table:
Years Ended	July 27, 2019	July 28, 2018	July 29, 2017

Amortization of purchased intangible assets:

Cost of sales	$624	$640	$556

Operating expenses

Amortization of purchased intangible assets	150	221	259

Restructuring and other charges	—	—	38

Total	$774	$861	$853

Answer the following question leveraging the table plus the background text, produce your answer and, if helpful, briefly explain your calculation. Conclude with JSON: {"answer": ["ANSWER"], "scale": "SCALE"} ("scale" = "" if no unit).

Text:
Amortization of Purchased Intangible Assets
The following table presents the amortization of purchased intangible assets (in millions):
The decrease in amortization of purchased intangible assets was due largely to the purchased intangible assets related to the divestiture of SPVSS business on October 28, 2018, partially offset by amortization from our recent acquisitions.

Question: What was the percentage change in the total amortization of purchased intangible assets between 2018 and 2019?

((774-861)/861) * 100, therefore {"answer": "-10.1", "scale": "percent"}