escalated (an escalation)
Reached a plateau (only used when the trend is up and then levels off)
Levelled off/ levelled out (the levelling off/out)
developed (a development)
remained almost the same (a period of almost no change)
was volatile
plunged (a plunge)
rose (a rise)
decreased (a decrease)
fluctuated (fluctuations, unstability)
crashed ( a crash)
tumbled (a tumble)
dropped (a drop)
declined (a decline)
shot up
increased (an increase)
Stabilized (stability)
grew (a growth)
fell (a fall)
went down ( a downward trend)
was erratic
rocketed
plummeted
Remained stable (stability)
