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Would you please post the serial number of the engine?
Did you replace the key switch last year?
Locate the large cannon plug in the wiring harness that comes from the boat to the engine. Unplug it, then using a small knife or screwdriver, make sure that the pins on the boat side of the plug are slightly spread apart. This will allow them to make better contact. Then try the engine again. If it still will not shut off, ensure that all ground wires are connected on the engine to the main harness.
Using a multimeter test the resistance on the switch with the key off between the black and the black/yellow wires.