I can't understand why I am not able to find future spreads for years before 2008 (typically for OJ, but have seen it on other products as well).
For any years after, I can find all the spreads I know.
Here is a little example of my problem :
I can find without any problems the future on OJ H2009-K2009.
I can also find any spreads after that (OJ H2010-K2010, OJ H2011-K2011, etc ...), but can't find any for years before (OJ H2008-K2008, OJ H2007-K2007, etc ...), whereas I know they exists.
Am I missing something ?