Final answer:
Winking is a voluntary action that varies in meaning across cultures. The percentage of people who primarily wink with their left eyes cannot be determined.
Step-by-step explanation:
Winking is a voluntary action that requires deliberate effort, unlike blinking which is a biological compulsion. It is not a biological necessity and varies in meaning across cultures and situations. Therefore, it is not possible to determine the exact percentage of people who primarily wink with their left eyes.