I actually checked, getting data from usinflationcalculator, which in turn gets its data from the US bureau of labour statistics. around 38% of accumulated
US inflation. The actual number is 89.79 billions. Adjusted for NY city could very well surpass 90 billion. Well done on the numbers!
But, as
@Kieran put, still 30 billions to account for. That is a 33% increase. There is population growth to account for part of that, but on the other hand costs likes public illumination and transport have gone down word wide. More importantly, human labour has been replaced by automation.
Still, part of what drives the inflation calculation comes from taxes (which impact prices). Cities, states and the union are, per definition,
generators of inflation (actually, of general price increase, which is different from inflation, but the point is that there is some hidden irony in adjusting a city/state/country budget by inflation).