pre_text: 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: .
post_text: 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. .
table: 2012 2011 2010
table: Functional Verification, Hardware and IP 30% 30% 24%
table: Custom IC Design 23% 22% 26%
table: Digital IC Design 23% 22% 23%
table: System Interconnect Design 9% 9% 9%
table: Design for Manufacturing 6% 7% 7%
table: Services and other 9% 10% 11%
table: Total 100% 100% 100%
question: Analyse this data from a financial earnings document. what is the difference in the percentage of product and related maintenance revenue contributed by the functional verification hardware and ip product group in 2010 versus 2012?