What percent was spent on capital budgets in 2001 vs 2021? The navy is currently undergoing building 4 or 5 major ship replacement cycles, replacing all of its aircraft (Top 10 airforce in the world), etc. My guess is that most of that budget is mandated by congress for that rather than for bottom paint on supply ships.
I looked briefly, and it's annoyingly hard to find summaries of the passed (not proposed) NDAA for a specific year, with top line and categorized breakdowns.