pre_text: Concentrations The Company may be subject to concentration of credit risk as a result of certain financial instruments consisting of accounts receivable and short term investments. The Company performs ongoing credit evaluations of its customers and generally does not require collateral in exchange for credit. The following table sets forth major customers accounting for 10% or more of the Company’s net revenue:
table: Year Ended
table: June 30,
  2019 June 30,
  2018 June 30, 2017
table: Tech Data Corporation 18% 14% 16%
table: Jenne Corporation 17% 13% 15%
table: Westcon Group Inc. 12% 13% 12%
question: Analyse this data from a financial earnings document. What was the change in the percentage that Tech Data Corporation accounted for between 2018 and 2019?