Relative Rarity is now expressed as a number. This is a calculated number based on survival rates for any given year and the number of varieties known so far. This removes the judgement element in previous assessments. Lower numbers are linked to lower survival rates combined with low numbers of varieties. To calculate the rarity of any year add up all the variant rarities.
So for example 1653 = 260 x 2 plus 25 = 545
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