How Many Canadian Dimes Were Made in the Years 1974, Silver 1968,1992 and 1997?

I have went through at least 500 dimes and have not found one of any of these. I checked 1968 silver with a magnet and non came out not magnetic. Also if you guys now what it could cost it would be nice but I mainly want to know how many were made to see if any are very rare.

 

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This is a pretty cool site for info such as mintage's.
http://en.numista.com/catalogue/canada-7.html

 

1968 silver: 70,460,000
1974 - 201,566,565,
1992 - 174,476,000
1997 - 43,126,000

Canada is removing all coins made of nickel from circulation and so they will be harder to find as the years roll by.
The new coins are made of plated steel.