20. The data below shows quarterly export of a cash crop from a country from 1995 - 2000 in million metric tons. II III IV 1995 5 8 9.5 26 48.5 1996 6.5 8.7 10.5 27 52.7 1997 6.8 9 12.1 26.5 54.4 1998 7.5 9.5 12 28 57 1999 7.8 10.5 12.5 29.5 60.3 2000 9.5 11.5 13.5 30 64.5 a. Plot the data for all the years b. Which component of time series is visibly present