The production of platinum, vital for catalysts and catalytic converters, has risen from 145 to 217.

The production of platinum, vital for catalysts and
catalytic converters, has risen from 145 to 217 metric tons per year over the
last 10 years. The ores are highly localized in South Africa, Russia, and
Canada. The reserves have risen from 56,000 to 71,000 metric tons in the same
time interval. Would you classify platinum as a critical material? Base your
judgment on these facts, making use of the relative growth rates of production
and reserves and on the dynamic index (equation (2.9) of the text) calculated
using 2005 data.