Describing trends (economics, statistcs)

Hi,

I learn to write about trends(charts) and use the variety of vocabulary to describe them accurately.

I have stumbled upon this trend describing exercise today. I find it quite interesting however I can not agree with some solutions given on the website.

The link is:

http://www.vub.ac.be/khnb/itv/oktober/jan/gb97-2.htm

The direct link to an image:

Solutions for the first chart description exercise say that there should be (2) gradual rise, (12) level off, (7) leap upwards and (11) to slump. My guess would be (2) level off, (12)gradual rise, (7) slump, (11) leap upwards.

Could you please take a look and advice whether I'm right of wrong?

Thanks:)