Rate of increase in 2013= (68.4-64.5)/64.5 *100=6.04
Rate of increase in 2014= (72.-68.4)/68.4 *100=10.93
Rate of increase in 2015= (83.8-72.6)/72.6 *100=15.42
Rate of increase in 2016= (100.6-83.8)/83.8 *100=20.40
Rate of increase in 2017= (112.8-100.6)/100.6 *100=12.12
Rate of increase in 2018= (128.4-112.8)/112.8*100=13.80
Rate of increase in 2019= (134.6-128.4)/128.40 *100=4.82
Rate of increase in 2020= (156.8-134.6)/134.6 *100=16.49
Rate of increase in 2021= (176.4-156.8)/156.8 *100=12.50
So year 2016 have the highest increase compared to previous year.