10 0 NO CHANGE 21 1 CUMULIFICATION 32 2 SLOW ELEVATION 43 3 RAPID ELEVATION 54 4 ELEVATION AND STRATIFICATION 65 5 SLOW LOWERING 76 6 RAPID LOWERING 87 7 STRATIFICATION 98 8 STRATIFICATION AND LOWERING 109 9 RAPID CHANGE 1115 15 MISSING VALUE 12