USD Canon prices for lenses at release.
70-200mm fl2.8L II - $2500 in 2010 - with USA inflation, in 2019 dollars, that's $2941.
24-70mm f/2.8L II $2200 in 2013 - with USA inflation, in 2019 dollars, that's $2423.
16-35mm f/2.8 III $2200 in 2016 - with USA inflation, in 2019 dollars, that's $2352.
So, in terms of adjustments for inflation, the 70-200 looks like it costs less, while the other lenses cost a bit more.
However, there is also the exchange rate, and the US dollar is much stronger now versus the yen, so that will adjust the equivalent price downward depending on the exchange rate. However, that adjustment only applies to the actual wholesale cost charged to Canon USA which is likely half or less of the retail price, since advertising, warranty service, shipping, warehousing, sales all are paid by Canon USA.
So, assuming the 50% figure, the prices with both upward inflation and downward currency adjustments for the stronger US dollar, the 2019 price equivalents would look something like this. I think that the prices below are on the low end.
70-200mmL $2660
24-70mmL $2348
16-35mmL $2296
So, with that adjustment, the lenses all took a jump in price.
If you buy all three, you will pay ~$496, more in 2019 dollars then the total of the three existing lenses when they were announced.
I did not try to check the inflation rates in Japan to see if they were equivalent.