A tonne of goals? Wow, that is a lot of goals. In fact it is 204..62 pounds of goals more than before Canada went metric in the mid- 1970s.

A puck weighs 6 ounces.
A tonne of goals converts to 5879 goals scored.
A ton of goals converts to 5333 goals scored.
Difference 546 goals

By going metric Canadian teams score 546 more goals per tonne than American teams score per ton.

I guess going metric did not help as no Canadian team has won the Cup since 1993.

Being a numbers person I am certain you appreciate  having this information.