I found the plot online and attached for clarity.
To get percentage increase we can use the following formula:
[tex]\Delta\%= \frac{N_{05}-N_{95}}{N_{95}} [/tex]
Here is the table with all the information needed to find the answer.
[tex]\begin{tabular}{llll}
Gym & N 2005 & N 1995 & Percentage increase \\
A & 1 & 0.5 & 100 \\
B & 1.20 & 1 & 20 \\
C & 4 & 2 & 100 \\
D & 4.5 & 3 & 50 \\
E & 5 & 4 & 25
\end{tabular}
[/tex]
We can see from the table that gym B had the smallest percent increase for 1995 to 2005.
