Dataset S1. The rainfall data of five regions (mm),,,,,,, ,,,,,,, Northern,Northeastern,Central,Eastern,Southern,,, 17.5,1.2,2.0,16.4,0.1,,, 6.1,0.2,9.3,1.3,4.2,,, 1.6,0.0,0.0,29.1,19.7,,, 0.0,25.1,6.0,11.4,0.7,,, 0.2,39.0,3.0,118.3,0.0,,, 3.6,0.8,9.6,7.8,0.3,,, 0.2,0.0,21.4,1,1.5,,, 0.0,6.8,1.2,1.3,0.0,,, 0.8,1.2,35.9,0.3,0.0,,, 0.3,0.6,7.6,12.9,0.0,,, 7.0,7.2,1.8,12.6,0.0,,, 0.8,0.0,4.4,0,65.8,,, 3.3,0.0,31.2,6.7,2.4,,, 18.4,0.8,8.6,4.2,24.6,,, 0.0,62.8,11.7,0.2,12.0,,, 0.0,0.0,1.2,,8.4,,, 0.0,4.4,1.4,,0.5,,, 1.2,0.0,8.7,,8.4,,, 5.6,4.5,2.2,,31.3,,, 0.4,0.5,11.3,,0.3,,, 0.4,19.6,8.8,,1.6,,, 0.3,0.6,0.4,,8.1,,, 3.5,27.6,,,1.0,,, 0.0,0.4,,,5.5,,, 2.5,0.0,,,0.0,,, 5.6,0.0,,,145.2,,, 0.2,0.0,,,23.2,,, 4.1,0.0,,,7.6,,, 15.6,,,,33.8,,,