A/C recharging

["Mike Miller (Volt) (Exchange)" <a-mikemi@Exchange.MICROSOFT.com>]

Anyone know what year they stopped using R-12 in the A/C?? Found 4 cans
of R-12 the other day and am curious if they will work in either my 91
200Q or a 91 Caprice. Seems to me they discontinued R-12 prior to that,
but I am not sure. Cans are OLD - they sold for $1.29!!!