How much is this GM Employee discount?

Some additional figures:

2005 Chevrolet TrailBlazer
Selected Style: 2WD LT 1SE
MSRP: $30,980.00
Chevrolet Employee Discount Price: (approx.) $24,715.03

2005 Chevrolet Cobalt Coupe
Selected Style: SS Supercharged
MSRP: $21,995.00
Chevrolet Employee Discount Price: (approx.) $20,034.15

2005 Chevrolet Avalanche 2500
Selected Style: 4x4 LT
MSRP: $43,215.00
Chevrolet Employee Discount Price: (approx.) $33,743.10

2005 Chevrolet Monte Carlo
Selected Style: Supercharged SS 1SB
MSRP: $30,825.00
Chevrolet Employee Discount Price: (approx.) $24,240.78

Well, just for kicks I decided to look a SSR up on GMBuyPower.com to compare the regular sticker price to the "GMS" GM employee discount price. I'm a GM employee and have access to an employee website that will show the GMS price. The SSR I used for an example stickered for $49290 and the GMS price for the same vehicle is $44403.05.....Not that it matters but this is a Silver '05 at the Chevy Dealer in Minden LA. with the last 4 digits of the vin# being 7421. Doing a little math, the discount appears to be a hair under 10%. Wow.... I sure thought we used to get a better discount than that....of course the discounts vary on different vehicles. I've been with GM for 23 years now and can remember that we for sure got 20% off on the Corvettes and it seemed like about 15% on most other vehicles.....of course this might have been 15 years ago....my how time flies. One thing to note....this particular GM offer is only available at participating dealers, which I imagine is most of them at this point. Oh well....just my 2 cents worth.