Write a method that counts the number of even numbers in a given list of integers.

Examples:

Input: numbers = [1, 2, 3, 4, 5, 6]
Output: 3
Explanation: The numbers 2, 4, and 6 are even

Input: numbers = [-2, -1, 0, 1, 2]
Output: 3
Explanation: The numbers -2, 0, and 2 are even

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