In 2005 it took 20.56 currency units to equal the value of 1 currency unit in 1912. in 1990 it took only 13.40 currency units to equal the value of 1 currency unit in 1912. the amount it takes to equal the value of 1 currency unit in 1912 can be estimated by the linear function v given by v(x) = 0.4868x + 13.9497 where x is the number of years since 1990 thus v(11) gives the amount it took in 2001 to equal the value of 1 currency unit in 1912