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