Please answer the given financial question based on the context.
Context: fiscal 2011 , primarily because of increased business levels , an increase in revenue related to the sale and lease of our hardware products and increased revenue recognized from bookings in prior periods . maintenance revenue decreased on a standalone basis during fiscal 2012 as compared to fiscal 2011 , primarily because of the increased allocation to product revenue due to the gradual decline in the average duration of our time-based software license arrangements over the last three years . product and maintenance revenue increased during fiscal 2011 , as compared to fiscal 2010 , due to reasons noted above and also due to the increase in revenue from the denali business which we acquired in the second quarter of 2010 . we expect the aggregate of product and maintenance revenue will increase during fiscal 2013 due to increases in the revenue from our software and ip products , partially offset by an expected decrease in revenue from our hardware products . services revenue decreased during fiscal 2012 , as compared to fiscal 2011 , primarily because certain of our design services engineers have been redeployed to internal research and development projects and to assist with pre-sales activities . services revenue increased during fiscal 2011 , as compared to fiscal 2010 , primarily because of cash collections from customers on orders fulfilled in years prior to 2011 for which revenue was recognized in fiscal 2011 upon receipt of cash payment , and because of higher utilization rates for our services personnel . we expect services revenue to decrease during fiscal 2013 , as compared to fiscal 2012 , as we expect certain of our design services engineers will continue to work on internal research and development projects , primarily related or our design ip and vip activities . revenue by product group the following table shows the percentage of product and related maintenance revenue contributed by each of our five product groups , and services and other during fiscal 2012 , 2011 and 2010: .
||2012|2011|2010|
|functional verification hardware and ip|30% ( 30 % )|30% ( 30 % )|24% ( 24 % )|
|custom ic design|23% ( 23 % )|22% ( 22 % )|26% ( 26 % )|
|digital ic design|23% ( 23 % )|22% ( 22 % )|23% ( 23 % )|
|system interconnect design|9% ( 9 % )|9% ( 9 % )|9% ( 9 % )|
|design for manufacturing|6% ( 6 % )|7% ( 7 % )|7% ( 7 % )|
|services and other|9% ( 9 % )|10% ( 10 % )|11% ( 11 % )|
|total|100% ( 100 % )|100% ( 100 % )|100% ( 100 % )|
as described in note 2 in the notes to consolidated financial statements , certain of our licensing arrangements allow customers the ability to remix among software products . additionally , we have arrangements with customers that include a combination of our products , with the actual product selection and number of licensed users to be determined at a later date . for these arrangements , we estimate the allocation of the revenue to product groups based upon the expected usage of our products . the actual usage of our products by these customers may differ and , if that proves to be the case , the revenue allocation in the table above would differ . the changes in the percentage of revenue contributed by the functional verification , hardware and ip product group are generally related to changes in revenue related to our hardware products. .
Question: what is the difference in the percentage of product and related maintenance revenue contributed by the custom ic design product group in 2010 versus 2012?


Answer: The answer is:-0.03