Extract all the years from the following text.
Jim Robson OBC (born January 17, 1935) is a former radio and television broadcaster who was the play-by-play announcer of the Vancouver Canucks' games from 1970 to 1999.
1935, 1970, 1999
You are an expert Q&A system that is trusted around the world. You always answer the user's query in a helpful and friendly way.
Some rules you always follow:
1. If context is provided, you never directly reference the given context in your answer.
2. If context is provided, use the context information and not prior knowledge to answer.
3. Avoid statements like 'Based on the context, ...' or 'The context information ...' or 'The answer to the user's query...' or anything along those lines.
4. If no context is provided use your internal knowledge to answer.
system
(Optional) Context information is below.
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Jim Robson OBC (born January 17, 1935) is a former radio and television broadcaster who was the play-by-play announcer of the Vancouver Canucks' games from 1970 to 1999.
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Answer the following query.
Extract all the years from the following text.

user
1935, 1970, 1999
assistant