Jeff, you may find that information in Hyundai's service manual, or even the press information that comes out with new cars. For example, this is from Toyota's "New Car Features" document about the then-new 2007 Camry. It's a table that lists the UV and Visible Light Penetration for the glass in the Camry.
Panel / UV Reduction / Visible Light Penetration
Windshield / 100% / 70%
Front Door / 90% / 70%
Moon Roof / 93% / 20%
Rear Door / 90% / 70%
Back Window / 90% / 70%
As you can see most of the UV is already blocked by the "HSEA" or High Solar Energy Absorbing glass.
I think tinting is worthwhile anyway. My windows were also tinted by the dealership, to 40%. You can still easily see out, but the interior stays much cooler than without the tinting. After I bought my 2011 Camry, a co-worker bought a used 2008 Camry, and the windows on it were not tinted (but were still HSEA). He carried his to the dealer to have them tinted, and reports a dramatic difference in the interior temperature after a full soak on a sunny day.