INTRODUCING A VISUAL
I'd like to show you...
Take a look at this...
This (graph) shows/ represents...
Here we can see...
Let's look at this...
Here you see the trend in...

COMPARISONS
This compares x with y
Let's compare the...
Here you see a comparison between...

DESCRIBING TRENDS

to go up
to increase    an increase
to rise          a rise
to climb        a climb
to improve    an improvement

to go down
to decrease    a decrease
to fall             a fall    
to decline       a decline
to deteriorate  a deterioration

to get worse    a downturn


to recover       a recovery
to get better   an upturn

to level off       a leveling off
to stabilize
to stay the same


to reach a peak   a peak
to reach a mximum
to peak

to reach a low point
to hit bottom

to undulate       an undulation
to fluctuate       a fluctuation

DESCRIBING THE SPEED OF CHANGE

INCREASE/FALL
a dramatic
a marked
a significant
a slight

TO INCREASE/FALL
dramatically
markedly
slightly
significantly