PART III F-32 December 31 2010 2011 NT$ NT$ (In Millions) Transportation equipment $  2,373 $  2,527 Miscellaneous equipment 7,154 6,974 Total cost  855,062 852,798 Revaluation increment on land  5,801 5,762 860,863 858,560 Accumulated depreciation Land improvements 1,004 1,041 Buildings 18,603 19,755 Computer equipment 12,232 10,946 Telecommunications equipment 527,819 531,124 Transportation equipment 1,637 1,254 Miscellaneous equipment 5,897 5,517 567,192 569,637 Construction in progress and advances payments related to acquisition of equipment 12,059 13,689 Property, plant and equipment, net $  305,730 $  302,612 Pursuant to the related regulation, Chunghwa revalued its land owned as of April 30, 2000 based on the publicly announced  value on July 1, 1999. These revaluations which were approved by the Ministry of Auditing resulted in increases in the  carrying values of property, plant and equipment of NT$5,986 million, liabilities for land value incremental tax of NT$211  million, and stockholders’ equity - other adjustments of NT$5,775 million. The amendment to the Land Tax Act, relating to the article to permanently lower land value incremental tax, went effective  from February 1, 2005. In accordance with the lowered tax rates, Chunghwa recomputed its land value incremental tax, and  reclassified the reserve for land value incremental tax of NT$116 million to stockholders’ equity - other adjustments. As of  December 31, 2011, the unrealized revaluation increment was decreased to NT$5,763 million by disposal of revaluation assets.  Depreciation expense on property, plant and equipment was NT$35,114 million, NT$32,737 million and NT$30,889 million for  the years ended December 31, 2009, 2010 and 2011, respectively. Interest expense capitalized for the years ended December  31, 2009, 2010 and 2011 were NT$1 million, NT$0.01 million, and NT$0.08 million, respectively. The capitalized interest  rates were 1.165%-1.604%, 1.1% and 1.10%-1.25%, respectively, for the years ended December 31, 2009, 2010 and 2011.  Chunghwa reclassified the unused property, plant and equipment amounting to NT$61 million to idle assets and recognized the  impairment loss of NT$61 million on those assets for the year ended December 31, 2010. Losses on property, plant and equipment arising from natural calamities such as earthquakes and typhoons were recorded in  non-operating expenses.