The 90.3% drop was a good indicator, next to the performance of its rivals.

FORBES: Left Overs of the Financial Crisis: Last Monoline to Lose AAA-Rating

Of course, I feel that fundamentals are often a lagging indicator and a stock can drop 20% and still be a growth company.

FORBES: 5 Rules for Success in 2013

It found every 10% rise in body mass index (BMI) - used as an indicator of body fat - led to a 4% drop of available vitamin D in the body.

BBC: Study finds obesity can 'lead to lack of vitamin D'