What is the number one bike city in the world?

Could you please clarify what criteria are being used to determine the number one bike city in the world? Is it based on the number of bicycles owned per capita, the number of bike lanes or paths, the percentage of commuters who bike to work, or something else entirely? Additionally, is there a specific time frame or year being considered when determining this ranking? Understanding the methodology will help me better understand the question and provide a more accurate answer.