increase in salaries and wages, and general and administrative expenses was driven by significant operational buildout in existing markets, and the decrease in share-based compensation was driven by the lack of share-based compensation expense affiliated with warrant vesting in 2021.
Operating Loss before Income Taxes and Other Income (Expense)
Operating loss before other income (expense) and provision for income taxes for the year ended December 31, 2021, was $(20,481,564), a decrease of $2,561,558 compared to operating income before other income (expense) and provision for income taxes of $(23,043,122) for the year ended December 31, 2020.
Total Other Income (Expense)
Total other expense for the year ended December 31, 2021, was ($9,086,911), an increase of $17,977,839 compared to other income of $8,890,928 for the year ended December 31, 2020. The increase in other expense is primarily attributable to increased interest expense of $5,479,522 in 2021 driven by the issuance of promissory notes, the impairment charge of $5,169,951 related to long-lived assets, as well as the decrease in the gain on disposal of assets of $13,350,138, partially offset by the 2020 derivative loss of $6,260,480.
Provision for Income Taxes
Income tax expense is recognized based on the expected tax payable on the taxable income for the year, using tax rates enacted or substantively enacted at year-end. For the year ended December 31, 2021, Federal and State income tax expense totaled $4,122,000 compared to a tax expense of $8,790,000 for the year ended December 31, 2020. The 2020 expense is significantly impacted by the $20.3 million gain affiliated with the divestiture of various subsidiaries.
Year ended December 31, 2020 Compared to the Year Ended December 31, 2019
Revenue
We derived our revenue from cultivating, processing, and distributing cannabis products through our seventeen dispensaries in five states and our wholesale sales to third parties in five states. For the year ended December 31, 2020, 76% of the revenue was generated from retail dispensaries and 24% from wholesale business. For the year ended December 31, 2019, 81% of the revenue was generated from retail business and 19% from wholesale business.
For the year ended December 31, 2020, Minnesota operations contributed approximately 34% of revenues, New York contributed 23%, Arizona contributed 15%, Pennsylvania contributed 14%, Maryland contributed 8%, New Mexico contributed 5%, and Ohio contributed 1%. For the year ended December 31, 2019, New York operations contributed approximately 34% of revenues, while Minnesota contributed 35%, Arizona contributed 15%, Pennsylvania contributed 10%, Maryland contributed 2%, and New Mexico contributed 4%.
Revenue for the year ended December 31, 2020 was $49,211,329, an increase of $19,255,157 or 64% compared to revenue of $29,956,172 for year ended December 31, 2019. The increase is primarily attributable to revenue contributions from the retail business in Minnesota of $6.1 million, the retail business in Pennsylvania of $3.3 million, the wholesale business in Maryland of $3.3 million, and the wholesale business in Arizona of $1.6 million. Key revenue drivers are increased market penetration of our branded products in the Maryland and Arizona wholesale markets and increased patient demand in Minnesota, which is partially the result of an increase in the number of qualifying conditions, which helps contribute to growth in certified patient enrollments. The two retail dispensaries in Pennsylvania, opened in the fourth quarter of 2019, also contributed significantly to year over year growth.
Retail revenue for the year ended December 31, 2020 was $37,236,301, an increase of $12,886,279 or 53% compared to retail revenue of $24,350,022 for the year ended December 31, 2019 primarily due to revenue contributions from Minnesota and Pennsylvania.