The plot shows the number of records of incidents only invovling fires from years 2000 to 2018. The colors represent the potentially life-threatening, alarm, fire, and null call type categories.
Despite the fact that the first half were categorized as null, we see that of the incidents reported each year involving fire, only a small amount are actual fires and there was only one year where incidents were categorized as potentially life-threatening.
This interactive scatterplot was inspired by Jverma's Scatterplot of Iris data : d3 v4.