Banks Mark to Market Actually Few Assets As a Percentage of Total Assets

I have been wondering what percentage of assets are marked to market on banks balance sheet. It is lower than what I even thought.

http://www.bloomberg.com/apps/news?pid=20601039&refer=columnist_reilly&sid=aD11FOjLK1y4

Of the $8.46 trillion in assets held by the 12 largest banks in the KBW Bank Index, only 29 percent is marked to market prices, according to my analysis of company data. General Electric Co., meanwhile, said last week that just 2 percent of assets were marked to market at its General Electric Capital Corp. subsidiary, which is similar in size to the sixth-biggest U.S. bank.