151,200mm you do l*w*h
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The first area is changing by -2mm/year, the second by 7mm/year, making a total of 9mm/year difference. 9mm/year times 2000 years = 18m
0.9 cm
9mm
Approximately 11/32 or .35 of an inch
Short answer, a 9mm is smaller in diameter and lighter.