This increase was a result of an increase in commissions of $9.0 million, from $24.7 million for the year ended December 31, 2005 to $33.7 million for the year ended December 31, 2006, but was partially offset by an increase in net trading losses of $2.4 million, from $1.1 million for the year ended December 31, 2005 compared to $3.5 million for the year ended December 31, 2006.