Russian Ruble: This Is Its Free-Fall in One Chart

— -- The Russian ruble has dropped to its lowest point in 16 years -- and has been in free-fall for some time as this chart shows.

The ruble, or the rouble, fell 20 percent today, its biggest intra-day fall since 1998, the time of the Russian financial crisis.

Overnight, the country's central bank raised its benchmark interest rate to try to slow the ruble's slide to no avail.