Here's why:
* Inflation: The value of money changes over time. A film that made $100 million in 1990 is not the same as a film that made $100 million in 2023.
* Global vs. Domestic: Do you mean worldwide opening weekend or just in the United States?
* Changing Box Office Landscape: The way box office figures are reported has evolved, and older data may not be as readily available or comparable to current figures.
To get a more accurate answer, you need to provide more context. For example:
* Which currency are you interested in? (USD, GBP, etc.)
* What year are you considering?
* Are you looking at domestic or worldwide opening weekend figures?
Once you provide these details, I can help you find the movie with the highest opening weekend gross.