Since 1992 governments have left office providing less money for CBC than when they arrived. This from the friends of public broadcasting and a hat tip to David Akin, is a graph showing funding in 2011 dollars for the CBC.
Friends.ca CBC Funding
As you can see the funding has generally been declining from 1990, took a big dip from 1994 to 1997. From 2000 to today CBC has lost about 100