decrease in tornadoes = 943-897 = 46
% decrease in tornadoes = (decrease in tornadoes) / (initial amount of tornadoes) x 100%
[tex]\begin{gathered} \frac{46}{943}\text{ }\times\text{ 100 = }\frac{460}{943}\text{ = 4.87805} \\ \approx\text{ 4.88 ( 2 decimal places )} \end{gathered}[/tex]