Using the following text, list the top 4 drugs by revenue for Pfizer in 2022?

Pfizer Inc. (/ˈfaɪzər/ FY-zər)[2] is an American multinational pharmaceutical and biotechnology corporation headquartered on 42nd Street in Manhattan, New York City. The company was established in 1849 in New York by two German entrepreneurs, Charles Pfizer (1824–1906) and his cousin Charles F. Erhart (1821–1891).

Pfizer develops and produces medicines and vaccines for immunology, oncology, cardiology, endocrinology, and neurology. The company's largest products by sales are the Pfizer–BioNTech COVID-19 vaccine ($37 billion in 2022 revenues), Nirmatrelvir/ritonavir ($18 billion in 2022 revenues), Apixaban ($6 billion in 2022 revenues), a pneumococcal conjugate vaccine ($6 billion in 2022 revenues), and Palbociclib ($5 billion in 2022 revenues).[1] In 2022, 42% of the company's revenues came from the United States, 8% came from Japan, and 50% came from other countries.[1]

Pfizer was a component of the Dow Jones Industrial Average stock market index from 2004 to August 2020.[3][4][5][6] The company ranks 43rd on the Fortune 500[7] and 43rd on the Forbes Global 2000.[8]

1. Pfizer–BioNTech COVID-19 vaccine
2. Nirmatrelvir/ritonavir 
3. Apixaban 
4. Palbociclib