Longterm American Productivity

Can some one post the american productivity graph here and explain it to me. I hear that since the 60s the prodcutivity of the american worker had been much lower then other nations and then the IT industry started in the 80 and systems started been implemented. According to Financial Times, apparently the productivity from those systems implementations is now been reaped and the US levels are much higher then most other countries. Although that has been best seen in the recession but apparently it has been occuring over the whole of the last decade.

So if anyone can explain what all this means and what a percentage increase in productivity means in terms of GDP or $$ per year, I would be much obliged :).