Our operating results are usually subject to seasonal fluctuations. Usually, the second and fourth quarter operating results are  higher than the first and third quarters because advertising expenditures are increased in anticipation of certain seasonal and  holiday spending by consumers. The negative financial and economic conditions effected the usual seasonal fluctuations in 2009. In 2010, as the economy started to stabilize and recover, our seasonal fluctuations returned to normal.  Our operating results are usually subject to fluctuations from political advertising. In even numbered years, political spending is  usually significantly higher than in odd numbered years due to advertising expenditures preceding local and national elections. Additionally, every four years, political spending is elevated further due to advertising expenditures preceding the presidential  election. Due to the contentious mid-term elections our political revenues in 2010 not only exceeded 2006 results, but exceeded  2008 presidential election year revenues as well.  The following table sets forth certain of our operating data from continuing operations for the years ended December 31, 2010,  2009 and 2008 (in millions). For definitions of terms, see the footnotes to the table in  Selected Financial Data . The following table presents our revenues from continuing operations, net of agency commissions, for the three years ended  December 31, 2010, 2009 and 2008 (in millions):  Our largest categories of advertising and their approximate percentages of 2010 net time sales, which includes the advertising  portion of our local and national revenues, were automotive (17.9%), professional services (15.5%), political (8.0%), schools  (a) Political revenue is not comparable from year to year due to the cyclicality of elections. See  Political Revenues  below for more  information. 2010 Annual Report    13  Percent Change 2010  2009  2008  ’10 vs. ‘09  ’09 vs. ‘08  Local revenues: Non-political $ 463.6  $ 410.2  $ 431.4  13.0%  (4.9%)  Political  12.8  2.3  11.0  (a)  (a)  Total local  476.4  412.5 442.4 15.5% (6.8%) National revenues:  Non-political  149.8  137.5  166.7  8.9%  (17.5%) Political  29.2  4.6 30.1 (a) (a) Total national  179.0  142.1  196.8  26.0%  (27.8%) Total net broadcast revenues  $ 655.4  $ 554.6  $ 639.2  18.2%  (13.2%)  Years Ended December 31,  2010 2009 2008 Net broadcast revenues  $ 655.4  $ 554.6  $ 639.2  Revenues realized from station barter arrangements  75.2  58.2  59.9  Other operating divisions revenues  36.6  43.7 55.4 Total revenues  767.2  656.5  754.5  Station production expenses  154.1  142.4 159.0 Station selling, general and administrative expenses  127.1  122.8  136.1  Expenses recognized from station barter arrangements  67.1  48.1 53.3 Depreciation and amortization  116.0  138.4  147.6  Gain on asset exchange  —  (4.9) (3.2) Other operating divisions expenses  30.9  45.5  60.0  Corporate general and administrative expenses  26.8  25.6 26.3 Impairment of goodwill, intangible and other assets 4.8  249.8  463.9  Operating income (loss) $ 240.4  $ (111.2)  $ (288.5)  Net income (loss) attributable to Sinclair Broadcast Group  $ 76.1  $ (135.7)  $ (246.5)  Broadcast Revenues Operating Data  BROADCAST SEGMENT  Seasonality/Cyclicality 