I got the computer to work out what my second, third, fourth selection were doing and for 2003 - present NSW I get.
1st choice 27.86% winners
2nd Choice 18.81% winners
3rd choice 13.24% winners
4th choice 9.82% winners
Your table suggests about 72.5% from the four choices Duritz which is pretty close, I make the total 69.7%

KV