Which of the following statements about data breaches in $2017$ is not true?

According to the Identity Theft Resource Center, the number of breaches in $2017$ increased by almost $45\%$ frons $2016.$

According to the Identity Theft Resource Center, data breaches involving the business sector represented over $55\%$ of all breaches.

According to the Identity Theft Resource Center, employee error was the leading cause of data breaches.

According to the Identity Theft Resource Center, over $50\%$ of data breaches involved social security numbers.