Comprehension:
The Sustainability Index $(\mathrm{SI})$ of a country at a point in time is an integer between $1$ and $100$. This question is related to $(\mathrm{SI})$ of six countries -$\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}, \mathrm{E}$, and $\mathrm{F}$ at three different points in time- $2016, 2020$, and $2024$. The plot represents the exact changes in their $(\mathrm{SI})$, with $\mathrm{X}$-coordinate representing $\%$ increase in $2020$ from $2016$, i.e., ($(\mathrm{SI})$ in $2020$ minus $(\mathrm{SI})$ in $2016$) / ($(\mathrm{SI})$ in $2016$), and $\mathrm{Y}$-coordinate representing $\%$ increase in $2024$ from $2020$. At any point in time, the country with highest $(\mathrm{SI})$ is ranked $1$, while the country with the lowest SI is ranked $6$. The following additional facts are known.
- In $2016$, $\mathrm{B, C, E}$, and $\mathrm{A}$ had ranks $1, 2, 3$, and $4$ respectively.
- $\mathrm{F}$ had lower $(\mathrm{SI})$ than any other country in $2016, 2020$, and $2024$.
- In $2024$, $\mathrm{E}$ was the only country with $(\mathrm{SI})$ of $90$.
- The range of $(\mathrm{SI})$ of the six countries was $60$ in $2016$ as well as in $2024$.
What was the $\mathrm{SI}$ of $\mathrm{C}$ in $2024$?