PART I The following table sets forth certain information regarding our revenues and income by business segment  for the periods indicated.  (*) Due to the redefinition of our financial reporting segments into five operating segments for fiscal year 2009,  segment disclosures for 2008 have been changed to conform to the segment disclosures of 2009.  As a result of the foregoing, in 2008 compared to 2009: segment income before tax for our domestic fixed  communications business increased by 12.8% from NT$15.5 billion to NT$17.4 billion; segment income before  tax for our mobile communications business decreased by 9.0% from NT$33.2 billion to NT$30.2 billion;  segment income before tax for our internet business decreased by 7.2% from NT$10.1 billion to NT$9.3 billion;  segment income before tax for our international fixed communications business decreased by 12.4% from  NT$2.9 billion to NT$2.6 billion; and segment loss for our others business segment increased by 17.5% from  NT$2.0 billion to NT$2.3 billion.  Our other income, net decreased by 24.4% from NT$1.1 billion in 2008 to NT$0.8 billion in 2009. This  decrease was primarily to a NT$1.4 billion decrease in interest income, partially offset by a NT$1.1 billion  decrease in the impairment loss on assets.  Income Tax  Our income tax was NT$13.9 billion in 2008, compared to NT$12.7 billion in 2009. Our effective tax rate  was 23.3% in 2008 and 22.3% in 2009.  As a result of the foregoing, our net income attributable to stockholders of the parent decreased by 2.8%  from NT$45.0 billion in 2008 to NT$43.8 billion in 2009. Our net margin was 22.3% in 2008 and 22.1% in  2009.  Other Income, Net  Net Income  Domestic  Fixed  Communications Mobile  Communications Internet International  Fixed  Communications Others  Adjustment  Total  (in billions of NT$) For the year ended December 31, 2009* Revenues from external customers 71.5  86.5  23.7  15.2  1.5  —  198.4  Intersegment service revenues 13.7  1.9  0.7  1.5  — (17.8) — Interest income — — — — 0.5  — 0.5  Other Income — 0.1  0.1  — 0.7  — 0.9  85.2  88.5  24.5  16.7  2.7  (17.8)  199.8  Segment income before tax 17.4  30.2  9.3  2.6  (2.3 ) — 57.2  For the year ended December 31, 2008* Revenues from external customers 73.1  88.8  23.0  15.9  0.8  —  201.7  Intersegment service revenues 11.9  1.9  0.6  1.6  — (16.0) — Interest income — — —  — 1.9  — 1.9  Other income 0.2  0.2  — — 1.0  —  1.4  85.2  90.9  23.6  17.5  3.7  (16.0)  205.0  Segment income before tax 15.5  33.2  10.1  2.9  (2.0 ) — 59.7  82