of licenses issued is restricted, but transfers of a license can take place. License fees were abolished in 2018. Eight taxi license holders own and control more than 10 licenses. The largest license holders are A2B Australia and the Gange Corporation, both of which hold licenses under a variety of names. A2B Australia also operates the 13CABS booking network, and the Gange Corporation operates the Silver Top Taxis booking network. These companies are the two main network service providers in the greater Melbourne area. Taxi operators pay the booking service an affiliation fee. More than 60% of licenses are assigned (or leased or rented) to taxi operators, who pay the license holder assignment fees. These fees fluctuate, and typically are in the order of $24,000 per annum. The operator owns, maintains and operates the taxi vehicle as well as the taximeter. Taxi operators may drive their taxis or may employ drivers. In June 2016 there were 14,771 active taxi drivers. Taxi drivers are required to be registered, and their registration certificate must be displayed in the taxi. A taxi operator can sell the taxi, comprising the assigned license, vehicle and meter, as a going concern. Besides receiving the assignment fees from the taxi operator, license holders also commonly benefit from capital growth in license values, or carry the risk of a decline in the market value of a license. Concern about the availability and quality of taxis continues to be a major public issue in Victoria. Significant reforms were made to the industry in 1994 under the Kennett Government, including taxis being required to be painted canary yellow. In 2002, peak service taxis, which must be yellow and a green top, were introduced to operate at night, between 3 pm and 7 am, and at special events only. In 2013, the taxi regulations were relaxed to allow colours other than yellow. The taxi industry in Victoria was the subject of a major government inquiry, the Taxi Industry Inquiry in 2011. The market value of a taxi license fluctuates over time. They were estimated to be valued at around $464,000, in October 2008. In April 2011, metropolitan taxi licenses had an approximate market value of $512,500. In June 2016 the approximate market value of a metro license was $158,688. Taxi licenses were abolished in 2018, and license holders are to be compensated at a cost of $494 million. In 2008, there