Looks like a 54-55% drop for second weekend. Which is right on or just shy of MCU's average of 55.6%
Some perspective:
1 Black Panther 44.7% 2 Thor 47.2% 3 Ironman 48.1% 4 Doctor Strange 49.5% 5 The Avengers 50.3% 6 Thor Ragnarok 53.5% Captain Marvel 54%-55% 7 Guardians of the Galaxy 55.3% 8 Avengers Infinity War 55.5% 9 Guardians of the Galaxy Vol. 2 55.5% 10 Antman 56.5% 11 Captain America The Winter Soldier 56.6% 12 Thor The Dark World 57.3% 13 Ironman 3 58.4% 14 Avengers Age of Ultron 59.4% 15 Ironman 2 59.4% 16 Captain America Civil War 59.9% 17 The Incredible Hulk 60.1% 18 Captain America The First Avenger 60.7% 19 Antman and the Wasp 61.2% 20 Spiderman Home Coming 62.2%