pre_text: The Group reported a loss before tax of £(42.7)m in the year, compared to a profit before tax of £20.9m in 2017/18. A loss after tax was £(33.8)m, compared to a £7.2m profit in the prior year. Adjusted profit before tax was £88.0m in the year, an increase of £9.4m compared to the prior year due to growth both in Trading profit and lower interest costs as described above. Adjusted profit after tax increased £7.6m to £71.3m in the year after deducting a notional 19.0% tax charge of £16.7m. Based on average shares in issue of 841.5 million shares, adjusted earnings per share in the year was 8.5 pence, growth in the year of +11.5%.
table: Adjusted earnings per share (£m) 2018/19 2017/18 Change
table: Trading profit 128.5 123.0 +4.5%
table: Less: Net regular interest (40.5) (44.4) +8.9%
table: Adjusted profit before tax 88.0 78.6 +12.1%
table: Less: Notional tax (19%) (16.7) (14.9) (12.1%)
table: Adjusted profit after tax6 71.3 63.7 +12.1%
table: Average shares in issue (millions) 841.5 836.8 +0.6%
table: Adjusted earnings per share (pence) 8.5 7.6 +11.5%
question: Analyse this data from a financial earnings document. What is the average notional tax for 2017/18 and 2018/19?