The data used in FIGURE 1 and FIGURE 2 is based on the ten-digit Harmonized Tariff Schedule (HTS), the most precise measure of solar cell and module imports available (specifically 8541.40.6020&6030).

Various opinions of definition before and after 1999, number of digits of significant figures and digit number s of uncertain figure s viz.

The first two digits represent the week of production, the 3rd digit represent the last figure of the year of production: Example: l: 166. (week of production number 16 of the year 2006).