The settings under 'Settings | Miscellaneous' on the 'Value calculation' tab must be as follows:

The number of weeks is calculated as follows:
(Number of days on which lessons are held) / (Number of teaching days per week) = (Number of weeks)
In this example lessons are held on 171 days of the school year and on 5 days per week, resulting in the following calculation:
171 / 5 = 34.2

The yearly value for Newton's one period lesson number 4 is therefore also 34.2.
