parameter

Open / Closed engines by year

2016: Closed engines (55)

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2014: Launched engines (25)

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2014: Closed engines (32)

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2013: Launched engines (40)

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2013: Closed engines (31)

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2008: Launched engines (42)

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2008: Closed engines (28)

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1999: Launched engines (51)

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1996: Launched engines (29)

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1995: Closed engines (0)

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    1994: Launched engines (3)

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    1993: Closed engines (0)

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      1992: Launched engines (1)

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      1992: Closed engines (0)

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        1991: Launched engines (2)

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        1991: Closed engines (0)

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          1990: Launched engines (1)

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          1990: Closed engines (0)

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