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Figure 100 is a graph. The origin is in the bottom left hand corner. The horizontal axis, labelled 'year', has 9 tick marks. Starting from the origin, the tick marks go from 1980 to 2012 in four-year intervals. The vertical axis, labelled 'euros per watt peak (€ W p superscript -1)', has 4 tick marks, from zero at the origin and increasing in tens to 30 at the top. The trace comprises an approximately smooth curve, starting with a steep downward slope on the left, becoming gradually shallower as it progresses forward in time. It starts at a value of about 26 in 1980, has fallen to about 10 in 1990, approximately 5 in 1996, and is a little less than 1 in 2012.

 5.12 Economics and implementation