I worked out the occurences of the main White systems from my own Pirc games to get a feel of where I should spend my Pirc study time.

There were some expected things, i.e. Classical Nf3 systems most common (about 30% of my Pirc games in Total) and the Austrian being the next most common.

However there were some surprises, namely the Argentine and 150 Attacks being less common than I was expecting (maybe it just felt like more due to painfull losses  )

Also note how often 3. Bd3 crops up. Fortunately I score well against it 

Here are my percentages. How do other Pirc players stack up?

21.5%  Austrian Attack f4
13.8%  Byrne Bg5
12.0%  3. Bd3
10.5%  Classical Nf3+Be2
7.7%   Classical Nf3+Bc4
5.7%   Classical Nf3+h3 (Accelerated Classical)
5.7%   Argentine Attack Be3+f3
4.8%   Classical Nf3+Bg5 
4.0%   Fianchetto g3
3.6%   Classical Nf3+Be3 (150 Attack)
3.0%   3. f3
0.8%   Kholmov Bc4+Qe2

Note, for the missing %, there are some occasional oddballs like the Spike, but it's mostly move 2. deviations like 2. f4 and 2. Nc3 where white doesn't go d4, e.g. trying for a closed Sicilian.