This is just grabbing the first news story from each one:
2014: https://www.abc.net.au/news/2014-10-21/youths-arrested-for-l...
2015: https://www.perthnow.com.au/news/australia/three-teenage-fir...
2016: https://www.naracoorteherald.com.au/story/4238341/cfa-firebu...
2017: https://www.newcastleherald.com.au/story/4828025/updated-acc...
2018: https://www.pressreader.com/australia/shepparton-news/201802...
Some of the 2009 Black Saturday bushfire were deliberately lit too: https://en.wikipedia.org/wiki/Black_Saturday_bushfires#Arson
Arson isn't new. The difference now is the scale of the fires and how hard they have been to fight because of that scale.
This is just grabbing the first news story from each one:
2014: https://www.abc.net.au/news/2014-10-21/youths-arrested-for-l...
2015: https://www.perthnow.com.au/news/australia/three-teenage-fir...
2016: https://www.naracoorteherald.com.au/story/4238341/cfa-firebu...
2017: https://www.newcastleherald.com.au/story/4828025/updated-acc...
2018: https://www.pressreader.com/australia/shepparton-news/201802...
Some of the 2009 Black Saturday bushfire were deliberately lit too: https://en.wikipedia.org/wiki/Black_Saturday_bushfires#Arson
Arson isn't new. The difference now is the scale of the fires and how hard they have been to fight because of that scale.