[15] Other income statement disclosures

The cost of materials declined by €58.3 million in the reporting year to €2,121.7 million (2012: €2,180.0 million).

Personnel expenses went down by €59.0 million to €1,143.8 million in 2013 (2012: €1,202.7 million). These personnel expenses included wages and salaries of €900.5 million (2012: €946.6 million), social security contributions of €203.7 million (2012: €222.1 million) and expenses for pensions of €39.5 million (2012: €34.0 million). The interest cost from the unwinding of the discount on estimated pension obligations is not recognised under personnel expenses and is instead reported under financial expenses as a component of interest cost of the defined benefit obligation. Pension expenses essentially comprised the pension entitlements of €23.0 million (2012: €16.2 million) and unrecognised past service income of €1.7 million (2012: unrecognised past service cost of €0.3 million) arising from plan amendments and curtailments.

Impairment losses and depreciation expenses on property, plant and equipment together with impairment losses and amortisation expenses on intangible assets amounted to €335.0 million in the reporting year (2012: €365.3 million). Inventories were written down by €13.7 million (2012: €8.2 million).

The breakdown of rental and lease payments expensed in the period and arising in connection with operating leases in which KION Group companies are lessees is as follows: >> Table 053

The expenses in connection with sub-leases relate to leases and rental agreements in which KION Group companies are both lessors and lessees. These expenses were offset by income of €40.9 million in 2013 (2012: €53.6 million).