A study of environmental pressure in a rapidly expanding metropolitan area shows that annual municipal solid waste (MSW) generation was 4.5 million tonnes in 2015. Due to urban migration and changing consumption patterns, this is projected to rise to 11.7 million tonnes by 2025. Calculate the projected percentage increase in annual MSW generation between 2015 and 2025.
72%72\%72%
160%160\%160%
260%260\%260%
61.5%61.5\%61.5%