Just for comparison: In Germany the pension rate dropped/will drop by (it's actually impressivly complicated if you include tax rule) about 5-6%.
That gap, we are told, we have to close by using (instead of the state work-based distribution system) the market. But the state helps! You get 175€/Year or an even higher tax reduction (for the rich, who don't need the help har har) if you invest at least 4%.
So... we have reduced the pension by 5-6%, but have to pay 4% directly and get 1-2% by tax breaks, which of course means it has to be payed by other taxes.
The costs for the worker are the same, but the employer (who has to match) pays less, and insurance companies get a big chunck of the money through fees.
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Anyway, the real point I wanted to make is that you can't compare e.g. 50% in 1990 with 45% in 2030. Productivity has increased a lot in that time, so while you get a slightly smaller share of the cake, the cake is a lot bigger.
The real problem is that taxation of work is catching ever less of the yearly GDP. If you would tax income from money at a comparable level to income from work (and the upcoming robotisation thing), and also tax wealth (esp. inheritance), you could very easily afford 60% and even more.