dude read the fine print these are not used for indicators of your chances of getting in.
Grades are one part of the selection process, along with your personal statement, your family/financial situation, and simply other things that make you stand out above the rest (community service, achievements, personality, experience).
And it is totally different from year to year.
You just have to catch the eye of the admission officers handling your application. He/she can be ****ed off and be stingy, while he/she can also be in a good mood and be more lenient. Plus, with the **** economy, standards are constantly changing.
1 year ago, UCI/UCD/UCSB had around the same admission rates. Due to budget cuts, UCI and UCD cut admissions alot more than UCSB.