Final answer:
The exact percentage of non-Hispanic Whites in management jobs is not provided in the supplied data. The information indicates a general increase in workforce diversity but does not specify management role demographics.
Step-by-step explanation:
The question you're asking about the percentage of non-Hispanic Whites in management-level jobs in the private and public sectors is not directly answered in the information provided.
However, the data indicates that workforce diversity is increasing, and the proportion of White Americans in the total population is projected to decrease over time. The given sources do not provide a specific percentage of non-Hispanic Whites in management positions.
It's important to note that while racial and ethnic diversity in the workforce is a key topic, the exact percentages for management-level jobs would likely be found in workforce demographic studies or specific organizational reports.