I was one of the last traders on the floor of the Toronto Stock Exchange before it shut down completely & I believe that was in the spring of 1996.  For years before that, there was a gradual migration to the brokerage offices as the trading system became more & more computerized,  doing away with the 'open outcry' method of trading.   BTW, almost all the 'Pros' (myself included) these days are in the system 'anonymously'....(represented by the number '01')....& most of us work from home.  I'm the 'market maker' on CMK but basically  I'm doing the same thing as you guys, but with a slight advantage as I get to 'participate' on both sides of the market at my discretion.