Each December 31 in Country Q, a tally is made of the country' s total available coal supplies -- that is, the total amount of coal that has been mined throughout the country but not consumed  In 1991 that amount was considerably lower than it had been in 1990
Furthermore, Country Q has not imported or exported coal since 1970
In Country Q, the amount of coal consumed in 1991 was greater than the amount of coal mined in 1991.