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%
24%
Custom IC Design
23%
22%
26%
Digital IC Design
23%
22%
23%
System Interconnect Design
9%
9%
9%
Design for Manufacturing
6%
7%
7%
Services and other
9%
10%
11%
Total
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: Analyse this data from a financial earnings document. 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?
Choices:
-7.67
0.88
-0.03
0
0.04
Correct choice index: 2