I shouldn't get any harder than any other year, 99.95 basically means you have an aggregate score better than 99.95% of the cohort - so the rough percentage that obtains that atar is basically constant (however the number of people changes since the number of people who complete VCE change each year).
I suppose that's a relief!
Sine, one question: Do you know if the number of people who are getting perfect VCE score is increasing, decreasing, or roughly constant? Because, like I said before, in 2014, 47 people got an atar of 2014,
35 in 2015, and 36 in 2018 - (idk about the other years). From this all I can say is that the number of people entirely depends on people who are completing VCE (once again, I am not too sure).
Edit: In case this may help you, my year of high school completion is in 2022 (So I am in year 9 right now).