Actually not 30 years. Because there you got it wrong. Technically its only the last 18 years.
You see apartheid left South Africa with a LOT of debt, thats how the Apartheid government imploded.
And then Thabo Mbeki paid it all off, other than about R0.5 trillion still left to be paid, we went unscathed through the world economic crisis (US housing crisis collapse), and the rand for once was actually strengthening and then BAM Zuma fired Mbeki.
Technically Mbeki only had 1 term and could actually come back.
No the ANC didnt sledge hammer our economy, that was Zuma...18 years ago.
Maybe youre still a bit young but under Mbeki we built 1.8 million houses, reduced debt to R0.5 trillion, the rand was R6.54 against the dollar (although its been weakening since 1978), SOE was one of the top rated, Eskom was one of the best rated and cheapest energy companies in the world, and we made a Budget Surplus (not a Budget Deficit of 8-10% under Ramaphosa. Unemployment was also down to 22% nationwide (34-35% today, and less than the 28% under PW Botha), and growth was 5.4% per year, far better than FW, Zuma and Ramaphosa (0.4%).
So defs not 30 years.