Their military budget is wayyy up due to the war, so if you’re ignoring recent giving you should also be ignoring recent spending.
In 2020 their military budget was ~21b. In 2020 the US gave 3.8b - so 21%, or 1/5. My number was based on 2024 budget and spending, which is why i said 1/4, but you’re probably right that pre-war numbers are more accurate if we’re talking about their long term spending trends.
Sources:
Israel military budget: https://data.worldbank.org/indicator/MS.MIL.XPND.CD?end=2020...
US money to israel, page 6: https://www.congress.gov/crs_external_products/RL/PDF/RL3322...