My account shows % total growth since I bought it, per share, that is what I keep eye on, see "Pulverized Sand Box "
What the market does is important, but what your individual shares are doing is more important, if you down 5% and market is up 10%, then you are in say commodities, if the market is down 5% and you up 10%, then you in commodities.
If u wanna perform same as market the ETF people and fund trackers on this site will tell u which ones to go for.
But if u wanna do it, every Monday put your figures (share price showing Share growth) in spread sheet and put in JSE index showing growth. Next Monday put it in again and you will have it vs JSE.
but u gonna beat it some weeks and some weeks the JSE will beat you, depending on which sectors your shares are in.