The production of all companies in the year 2014 is how much per cent less than the production of all companies in the year 2015?

Total production of all companies :

Year 2014 ⇒ (412 + 444 + 302 + 372 + 504) thousand tonnes

= 2034 thousand tonnes

Year 2015 Ÿ (503 + 529 + 298 + 398 + 597) thousand tonnes

= 2325 thousand tonnes

∴ Required per cent

$=\left(\frac{2325-2034}{2325}\right) \times 100=\frac{29100}{2325} \approx 12.5$