What is the trend in oyster spat numbers shown in the graph?

There is a great variation present in the graph about the trend in oyster spat numbers.

Explanation:

In the graph, the number of oyster spat is 4 per bushel in the year 1998 which is suddenly increases in the next year i. e. 39 spat per bushel. There is a great variation present in the graph about the production of oyster spat. The highest oyster spat i. e. 78 spat per bushel which were achieved in the year 2010. While again it is decreases and 31 spats per bushel were gained in the last year of the graph.

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