Pretty much anyone this side of Mexico stopped producing any silver coins for circulation in the 1970s or earlier (I think the exact date is 1976).
Then Mexico reintroduced bimetallic coins with silver centers (10, 20 and 50 pesos) that did, apparently, continue up to 1995. No idea why.
Supposedly the 100 peso silver-center coins, issued since 2003, are intended for circulation; if so, silver coins are issued for circulation to this day.
Numista disagrees (saying they are a non-circulating issue); it's probably hard to say one way or the other (Wikipedia seemed to go on the "supposed to circulate" side).