In which year(s) was/were the exports less than the imports by p%, where p lies between 25 and 30?

We need to find the difference between imports and exports as a percentage of Imports for each year:

2014: Difference = 120

Percentage = (120/420)*100 = 28.57%

2015: Difference = 280

Percentage = (280/520)*100 = 53.84%

2016: Difference = 150 

Percentage = (150/430)*100 = 34.88%

2017: Difference = 40

Percentage = (40/400)*100 = 10%

2018: Difference = 130

Percentage = (130/450)*100 = 28.89%

2019: Difference = 80

Percentage = (80/480)*100 = 16.67%

So the change in percentage for 2014 and 2018 is between 25% to 30%.