Graph of current year vs last year

I scrape real time lake level data from a government website and use that for a variety of purposes. One of those is the creation of this graph:

I’d like to also be able to show a line for the previous year to add a little meaning to the data.

I’m curious about different ways of approaching this?

Eventually, when I have enough years of data, I would also like to show a line with annual averages - but that is a few years away. For now, just showing last year would be great.

Thanks

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