please help translate smartctl output to human language

[Wojciech Puchar]

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> Integers representing VALUE, WORST and THRESH columns are "normalized values".
> Over time, VALUE of Total_LBAs_Written will be declining.
> Once it reaches THRESH value it is considered 'Old_age', meaning it's prone
> to all kinds of malfunctions expected from old hardware.
> That doesn't mean you want be able to use it afterwards.
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but are this proportional? I mean i had 100 when drive was new, now it's 
99 so it's 1% used up (maybe near 2%)?

Seems quite a little after 2 years of usage