Watch out! Soon we'll have steel nickels and plastic pennies and the circulating supply will dry-up in a heartbeat.
I always wondered if someone had a website with that table done up. Here's my own for Canadian coins (in C$):
1920-42 1c $0.0204
1942-79 1c $0.0209
1980-81 1c $0.0181
1982-96 1c $0.0161
Zinc 1c $0.0072
1922-81 5c $0.0838
1982-00 5c $0.0440