According to the chart, you'll obviously notice that there're so many curves, up and down. This somehow related to the releases chart, but still, let's take a deeper look on some events.
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In 1984 there's the game named Duck Hunt which has 28.31 million sales(count as 56.22% of that year sales)
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In 1985 there's the game named Super Mario Bros. which has 40.24 million sales(count as 74.6% of that year sales)
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In 1989 there's the game named Tetris which has 30.26 million sales and the game named Super Mario Land which has 18.14 million sales(both games count as 65.89% of that year sales)
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In 1995, the first event of Electronic Entertainment Expo was held in Los Angeles Convention Center. In this event, there will be many game publishers gathering up and set up their own exhibition in the event, which could make people more interested in new video games and boost their sales up.
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On October 2000, Sony released PlayStation 2. This boosts video game sales up in 2001-2002.
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On November 2004, Nintendo DS was released. On November 2005, Wii and XBox360 were released. On November 2006, PlayStation 3 was released. The releases of these 4 brand new and popular gaming platforms significantly boost the video game sales up from 2004 to 2008.