P AR T I 82 from NT$15.0 billion in 2009 to NT$15.9 billion in 2010. This increase was principally due to the strong sales of mobile smart  phones and the general recovery of the economy in the R.O.C.  Internet revenues comprised 11.9% and 12.1% of our revenues in 2009 and 2010, respectively. Our revenues attributable to  our internet business increased by 3.5% from NT$23.7 billion in 2009 to NT$24.5 billion in 2010. The increase was mainly due to a  1.6% increase in the number of our total HiNet broadband subscribers from approximately 3.5 million as of December 31, 2009 to  approximately 3.6 million as of December 31, 2010. Our HiNet subscribers remained at approximately 4.1 million subscribers as of  December 31, 2009 and 2010 because the increase of our HiNet broadband subscribers was offset by the decrease of HiNet dial-up  subscribers. As of December 31, 2010, approximately 82.0% of our broadband customers were also HiNet subscribers, using HiNet  as their ISP.  Our international fixed communications revenues increased by 1.9% from NT$15.2 billion in 2009 to NT$15.5 billion in  2010. This increase was mainly due to the increase in revenues from our international leased line services and international data  services.  International long distance telephone services.  Our international long distance telephone revenues remained constant at  NT$12.9 billion in 2009 and 2010 because the decrease of the unit price was offset by the growth in both the traffic volume of calls  using calling cards and the wholesale of the traffic from 2009 to 2010. Our international settlement revenues decreased from NT$3.5  billion in 2009 to NT$3.2 billion in 2010. This decrease was primarily due to the appreciation of NT dollars.  International leased line and international data services.  Our international leased line and international data revenues  increased by 19.1% from NT$1.68 billion in 2009 to NT$2.00 billion in 2010. The increase was mainly because of the overseas  market expansion and the increased demand of multinational corporations.  Our operating costs and expenses increased by 2.2% from NT$142.0 billion in 2009 to NT$145.0 billion in 2010. This  increase was primarily due to the increases in costs of handsets sold. As a percentage of revenues, operating costs and expenses  increased from 71.5% in 2009 to 71.7% in 2010.  Operating costs include depreciation and amortization expense, personnel expenses, cost of goods sold, interconnection and  service expense, costs of materials and maintenance and spectrum usage and license fees.  Our operating costs increased by 2.3% from NT$112.7 billion in 2009 to NT$115.3 billion in 2010. This increase was  principally a result of an increase of NT$3.0 billion in cost of goods sold, an increase of NT$1.2 billion in personnel expenses mainly  due to increase in bonus expense because of net income growth, and a NT$0.6 billion increase in ICT costs due to the increase in  revenue, partially offset by a decrease of NT$2.2 billion in depreciation.  Our marketing expenses, which include personnel expenses, expenses relating to advertising and marketing-related activities  and provision for bad debt increased by 0.8% from NT$22.3 billion in 2009 to NT$22.5 billion in 2010. This increase was principally  a result of a NT$0.5 billion increase in bonus, partially offset by a decrease of NT$0.3 billion in expenses relating to advertising and  other marketing-related activities.  Marketing  Operating Costs  Operating Costs and Expenses  International fixed communications  Internet 