As the Nasdaq composite approaches its dot-com peak, a look at the index over time

It's taken 15 years for the Nasdaq composite index to approach the record high of 5,048 it reached back in March 2000, at the height of the tech-stock boom that would later collapse. Here are some things that have changed since then, in the index and in the U.S.

Biggest company in the index

2000: Microsoft ($525 billion)

2015: Apple ($759 billion)

Biggest industries in index

2000: Technology, 64.9 percent; Telecommunications, 11.8 percent; consumer services, 7.7 percent.

2015: Technology, 43.3 percent; Consumer services, 20.8 percent; Health Care, 16.1 percent.

Number of tech stocks in the Nasdaq:

2000: 1,207

2015: 445

In the news

2000: Y2K bug, controversy over Cuban immigrant boy Elian Gonzalez, U.S. Presidential election between George W. Bush and Al Gore. "American Beauty" wins Oscar for Best Picture.

2015: Killings of French cartoonists over depiction of prophet Muhammad; U.S. moves to normalize relations with Cuba; identity of Islamic State militant shown beheading hostages is revealed. "Birdman" wins Oscar for Best Picture.

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Index data supplied by Nasdaq.