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If in 2000 your ratio was 1 in 100, whereas now in 2012 your ratio is 1 in 1000, that means today's ratio is 10% of your ratio in the year 2000
If today's ratio was 25% of the year 2000, that would be that it went from 1 in 100 down to 1 in 400
Think of it this way 1/400 is 25% of 1/100
1/1000 is 10% of 1/100 etc
Easiest way to work it out for those who don't like ratios, is just to take the number from the bottom of the old ratio, so if it was 1/100 then take the 100, then divide it by the number at the bottom of today's ratio, let's use the 1/400, this gives 100/400 = 1/4 = 0.25, then times by 100 to turn it into a percentage = 25%
Just to show that always works, let's do it for the other one
100/1000 = 1/10 = 0.1 then times by 100 = 10%
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