This is a difficult question to answer, as the photovoltaic market has experienced exponential growth over the past decade. In 1999 there were less than 1,000 installations in the United States, but by 2008, there were almost 19,000. Assuming that this trend has increased, I would estimate that there were at least 21,000 installations in 2009, but we’ll have to wait until statistics come out. However, on page 7 of the attached .pdf, you can see the increase over the past decade.
I hope this helped!
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