This paper analyzes anonymized conversation data from 200,000 Microsoft Bing Copilot users to understand the economic impact of generative AI. The most common tasks for which users requested AI assistance were gathering information and writing, while the most common tasks for which AI was performed were providing information and assistance, writing, teaching, and consulting. By combining these activity categories with the success rate and scope of the task, we computed an AI applicability score for each occupation. The results showed that AI applicability scores were highest for knowledge-working occupations, such as computer and math-related occupations, office and administrative support occupations, and sales occupations, whose main tasks are providing information and communicating. We also performed a comparative analysis of the correlation between the most successful types of work activities, wages, and education levels and the applicability of AI, and the actual usage and the predicted impact of AI by occupation.