pre_text: Operating Expenses The following table highlights our operating expenses and operating loss as a percentage of net revenues:
table: Year Ended 
table: June 30,
  2019 June 30,2018 June 30,
  2017
table: Research and development   21.1% 18.7% 15.4%
table: Sales and marketing   28.7% 27.2% 26.8%
table: General and administrative   5.6% 5.2% 6.2%
table: Acquisition and integration costs, net of bargain purchase gain   0.3% 5.5% 2.2%
table: Restructuring charges, net of reversals   0.5% 0.8% 1.5%
table: Amortization of intangibles   0.6% 0.9% 1.4%
table: Total operating expenses 56.8% 58.3% 53.5%
table: Operating (loss) income   (1.5)% (3.9)% 1.0%
question: Analyse this data from a financial earnings document. What was the change in the Total operating expenses as a percentage of net revenues between 2018 and 2019?