The useful lives, depreciation methods and residual
values applying to property, plant and equipment are reviewed at
least annually and in case they change significantly, depreciation
charges for current and future periods are adjusted accordingly.
If the carrying amount of an asset exceeds its recoverable
amount an impairment loss is recognised immediately in profit
or loss. At each end of the reporting period, it is assessed
whether there is any indication that an item of property, plant
and equipment may be impaired (see also below “Impairment
of non-fi nancial assets”).