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2017 MX 100D battery health

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I own a '17 MX 100D (34K miles). I charge mine at 73% and used see 206miles range for it. as of recent now it only shows me 200 miles instead.
Last weekend I took a road trip and I charged the car at 90% 2 times. After I am back from the trip, I reduced it to 73% and noticed the lower miles.
I am curious to know about whats the best way to check for battery degradation. TIA.