pre_text: Operating expenses nm—not meaningful Research and development expenses Research and development expenses increased $15.8 million in the year ended March 31, 2018 compared to the year ended March 31, 2017, which was primarily attributable to increases in personnel-related costs of $10.1 million, information technology and facility costs of $2.3 million, professional services costs of $0.9 million, share-based compensation expense of $0.7 million, travel and other costs of $0.5 million and data center costs of $0.5 million. Research and development expenses for the year ended March 31, 2018 as compared to the year ended March 31, 2017 were negatively impacted by approximately $0.5 million primarily as a result of the weakening of the U.S. dollar relative to the British pound. Personnel-related cost increased primarily as a result of salaries and benefits associated with increased headcount throughout the year, information technology and facility costs increased primarily as a result of increased headcount, professional services costs increased primarily as a result of the use of research and development contractors and share-based compensation expense increased primarily as a result of share option grants since the prior year. Sales and marketing expenses Sales and marketing expenses increased $25.1 million in the year ended March 31, 2018 compared to the year ended March 31, 2017, which was primarily attributable to increases in personnel-related costs of $13.5 million, marketing costs of $4.7 million, information technology and facilities costs of $3.6 million, travel and other costs of $2.3 million and professional services of $0.8 million. Sales and marketing expenses for the year ended March 31, 2018 as compared to the year ended March 31, 2017 were negatively impacted by approximately $1.4 million primarily as a result of the weakening of the U.S. dollar relative to the South African rand and British pound. Personnel-related costs increased primarily as a result of salaries and benefits associated with increased headcount. Information technology and facility costs and travel and other costs increased primarily as a result of increased headcount. General and administrative expenses General and administrative expenses increased $9.1 million in the year ended March 31, 2018 compared to the year ended March 31, 2017, which was primarily attributable to increases in personnel-related costs of $5.0 million, share-based compensation expense of $1.2 million, information technology and facilities costs of $1.0 million and professional services costs and material supplies of $0.6 million each. General and administrative expenses for the year ended March 31, 2018 as compared to the year ended March 31, 2017 were negatively impacted by approximately $0.3 million primarily as a result of the weakening of the U.S. dollar against the British pound and South African rand. Personnel-related costs increased primarily as a result of salaries and benefits associated with increased headcount. Share-based compensation expense increased primarily as a result of share option grants since the prior year. Information technology and facility and material supplies costs increased primarily as a result of increased headcount. Restructuring and Impairment of long-lived assets In the fourth quarter of fiscal 2018, upon the exit of our Watertown, Massachusetts corporate office space, we recorded a restructuring charge of $0.8 million for remaining non-cancelable rent and estimated operating expenses for the vacated premises, net of sublease rentals, and a non-cash impairment charge of $1.7 million primarily related to leasehold improvements.
table: Year ended March 31, Period-to-period change
table: % Change  2018 2017 Amount % Change
table: (dollars in thousands)
table: Operating expenses:                
table: Research and development $38,373 $22,593 $15,780 70%
table: Sales and marketing 121,246 96,154 25,092 26%
table: General and administrative 36,989 27,875 9,114 33%
table: Impairment of long-lived assets   1,712 — 1,712 nm 
table: Restructuring   832 — 832 nm 
table: Total operating expenses  $199,152 $146,622 $52,530 36%
question: Analyse this data from a financial earnings document. What was the average Research and development expenses in 2017 and 2018?