Final answer:
The provided information does not contain the specific percentage of companies in 1996 with at least one casual dress day each week. We cannot provide this number without the correct statistical reference.
Step-by-step explanation:
The question asks by 1996, what percent of all companies had at least one casual dress day each week. To answer this question, we would typically reference a specific study or set of statistics that covers the dress code policies of companies during that time. However, the provided information does not contain any specific percentage of companies in 1996 with a casual dress day policy. Instead, we have statistics that might be related to a survey or academic piece discussing trends in workplace attire and the differences in dress codes across various cultures and workplaces.
Given the provided information, without a clear reference to the statistics from 1996, we cannot confidently state what percent of companies had a casual dress day policy at that time. It's important to verify information with reliable data when discussing historical or survey-based questions to ensure accuracy.