System: You are an API parameter validator. Generate parameters strictly according to the API specification. Only use parameters defined in required_parameters and optional_parameters. Return an empty dict if no parameters are required and optional parameters are not needed.
User: Review API details:
https://gaialens-historical-esg-scores.p.rapidapi.com/scores/historical/{year} (GET)
Required: [{'name': 'year', 'type': 'string', 'description': 'The year for which historical scores are requested. Must be less than or equal to 2020.', 'default': '2020'}]
Optional: [{'name': 'Content-Type', 'type': 'string', 'description': 'Specifies the media type of the resource.', 'default': ''}, {'name': 'sedol', 'type': 'string', 'description': 'The SEDOL code for the company.', 'default': ''}, {'name': 'isin', 'type': 'string', 'description': 'The ISIN code for the company.', 'default': ''}, {'name': 'companyname', 'type': 'string', 'description': 'The name of the company for which scores are requested.', 'default': 'Apple Inc.'}]
Past tests: Initial Attempt 1:
Parameters: {'year': '2019', 'Content-Type': 'application/json', 'sedol': 'B1Y8QZ3', 'isin': 'US0378331005', 'companyname': 'Microsoft Corp'}
Result: Failed
Analysis: Failed - possible issues: Message from API: Bad request syntax or unsupported method - invalid request parameter(s)

Initial Attempt 2:
Parameters: {'year': '2020', 'Content-Type': 'application/json', 'sedol': 'B1Y8QZ4', 'isin': 'US02079K3059', 'companyname': 'Tesla Inc.'}
Result: Failed
Analysis: Failed - possible issues: Message from API: Bad request syntax or unsupported method - invalid request parameter(s)

Recent Attempt 3:
Parameters: {'year': '2020', 'Content-Type': 'application/json', 'sedol': 'B1Y8QZ8', 'isin': 'US02079K3075', 'companyname': 'Facebook Inc.'}
Result: Failed
Analysis: Failed - possible issues: Message from API: Bad request syntax or unsupported method - invalid request parameter(s)

Recent Attempt 4:
Parameters: {'year': '2020', 'Content-Type': 'application/xml', 'sedol': 'B1Y8QZ9', 'isin': 'US02079K3083', 'companyname': 'Oracle Corporation'}
Result: Failed
Analysis: Failed - possible issues: Message from API: Bad request syntax or unsupported method - invalid request parameter(s)

Recent Attempt 5:
Parameters: {'year': '2017', 'Content-Type': 'application/json', 'sedol': 'B1Y8QZ2', 'isin': 'US1234567890', 'companyname': 'Adobe Inc.'}
Result: Failed
Analysis: Failed - possible issues: Message from API: Bad request syntax or unsupported method - invalid request parameter(s)

Used parameters: - {'Content-Type': 'application/json', 'companyname': 'Microsoft Corp', 'isin': 'US0378331005', 'sedol': 'B1Y8QZ3', 'year': '2019'}
- {'Content-Type': 'application/xml', 'companyname': 'Google LLC', 'isin': 'US0378331006', 'sedol': 'B1Y8QZ5', 'year': '2020'}
- {'Content-Type': 'application/json', 'companyname': 'Facebook Inc.', 'isin': 'US02079K3075', 'sedol': 'B1Y8QZ8', 'year': '2020'}
- {'Content-Type': 'application/xml', 'companyname': 'Oracle Corporation', 'isin': 'US02079K3083', 'sedol': 'B1Y8QZ9', 'year': '2020'}
- {'Content-Type': 'text/plain', 'companyname': 'Amazon.com Inc.', 'isin': 'US02079K3067', 'sedol': 'B1Y8QZ6', 'year': '2020'}
- {'Content-Type': 'application/vnd.api+json', 'companyname': 'Netflix Inc.', 'isin': 'US0378331007', 'sedol': 'B1Y8QZ7', 'year': '2018'}
- {'Content-Type': 'application/json', 'companyname': 'Adobe Inc.', 'isin': 'US1234567890', 'sedol': 'B1Y8QZ2', 'year': '2017'}
- {'Content-Type': 'application/json', 'companyname': 'Tesla Inc.', 'isin': 'US02079K3059', 'sedol': 'B1Y8QZ4', 'year': '2020'}

Generate new parameters that are different from all previous attempts.
Assistant: