If Percentage Change Is Asked in the Question,it Is Calculated

$$\begin{array} { | c | c | c | } \hline \text { Year } & \text { GDP } & \text { Gross Investment } \\\hline 1929 & 103.1 & 16.7 \\\hline 1930 & 90.4 & 10.8 \\\hline 1931 & 75.8 & 5.9 \\\hline 1932 & 58.0 & 1.1 \\\hline 1933 & 55.6 & 1.7 \\\hline 1934 & 65.1 & 3.7 \\\hline 1935 & 72.3 & 6.7 \\\hline 1936 & 82.7 & 8.7 \\\hline 1937 & 90.8 & 12.2 \\\hline 1938 & 84.9 & 7.1 \\\hline 1939 & 90.8 & 9.3 \\\hline\end{array}$$ If percentage change is asked in the question,it is calculated by dividing the amount changed by the original number.
-Gross Investment fell by ____________ percent from 1937-38.