Please answer the given financial question based on the context.
Context: notes to consolidated financial statements the components of accumulated other comprehensive loss , net of related tax , are as follows: .
|( millions ) as of december 31|2007|2006|2005|
|net derivative gains ( losses )|$ 24|$ 15|$ -11 ( 11 )|
|net unrealized investment gains|76|73|52|
|net foreign exchange translation|284|118|-119 ( 119 )|
|postretirement plans|-1110 ( 1110 )|-1216 ( 1216 )|-1077 ( 1077 )|
|accumulated other comprehensive loss|$ -726 ( 726 )|$ -1010 ( 1010 )|$ -1155 ( 1155 )|
aon corporation .
Question: what is the percentual increase observed in the net derivative gains during 2006 and 2007?


Answer: The answer is:0.6