pre_text: For the periods indicated, the weighted-average fair value of options and weighted-average assumptions were as follows: *Options valued using Monte Carlo Valuation Method As of June 30, 2019, the total compensation cost related to the unvested stock option awards not yet recognized was approximately $24.1 million, which will be recognized over a weighted-average period of approximately 3.0 years. No cash was used by us to settle equity instruments granted under share-based compensation arrangements in any of the periods presented. We have not capitalized any share-based compensation costs as part of the cost of an asset in any of the periods presented. For the year ended June 30, 2019, cash in the amount of $35.6 million was received as the result of the exercise of options granted under share-based payment arrangements. The tax benefit realized by us during the year ended June 30, 2019 from the exercise of options eligible for a tax deduction was $2.9 million. For the year ended June 30, 2018, cash in the amount of $54.4 million was received as the result of the exercise of options granted under share-based payment arrangements. The tax benefit realized by us during the year ended June 30, 2018 from the exercise of options eligible for a tax deduction was $1.5 million. For the year ended June 30, 2017, cash in the amount of $20.8 million was received as the result of the exercise of options granted under share-based payment arrangements. The tax benefit realized by us during the year ended June 30, 2017 from the exercise of options eligible for a tax deduction was $2.2 million.
table: Year Ended June 30,
table: 2019 2018 2017
table: Weighted–average fair value of options granted $8.39 $7.58 $7.06
table: Weighted-average assumptions used:
table: Expected volatility 25.72% 26.95% 28.32%
table: Risk–free interest rate 2.57% 2.18% 1.46%
table: Expected dividend yield 1.54% 1.50% 1.43%
table: Expected life (in years) 4.44 4.38 4.51
table: Forfeiture rate (based on historical rates) 6% 6% 5%
table: Average exercise share price $38.81 $34.60 $31.75
table: Derived service period (in years)* N/A N/A 1.79
question: Analyse this data from a financial earnings document. What is the total tax benefit for fiscal years 2017-2019?