Which year shows the highest change in revenue obtained from journals?

Step 1: Read journal revenues from the graph.
- 2014: $\;45$ lakh
- 2015: $\;45$ lakh
- 2016: $\;44$ lakh
- 2017: $\;44$ lakh
Step 2: Compute year-to-year changes.
- Change from 2014 to 2015: $|45-45|=0$
- Change from 2015 to 2016: $|44-45|=1$
- Change from 2016 to 2017: $|44-44|=0$
Step 3: Identify maximum change.
The largest change is $1$ (between 2015 and 2016). So the answer is 2015. \[ \boxed{2015} \]




