Between 2001 and 2011 shares in Tottenham Hotspur F.C. were listed on the Alternative Investment Market (AIM index). The majority shareholder, ENIC International Ltd, is an investment company established by the British billionaire Joe Lewis (British businessman). Daniel Levy (businessman), Lewiss partner at ENIC, is Executive Chairman of the club. They had acquired 29.9% after buying 27% share of the club for £22 million from Sugar in 1991. Shareholding by ENIC increased over the decade through the purchase of the remaining 12% holding of Alan Sugar in 2007 for £25m, and the 9.9% stake belonging to Stelios Haji-Ioannou through Hodram Inc in 2009. On 21 August 2009 the club reported that they had issued a further 30 million shares to fund the initial development costs of the new stadium project, and that 27.8 million of these new shares had been purchased by ENIC. The Annual Report for 2010 indicated that ENIC had acquired 76% of all Ordinary Shares and also held 97% of all convertible redeemable preference shares, equivalent to a holding of 85% of share capital. Following an announcement at the 2011 AGM, in January 2012 the club confirmed that they had been transferred into the private ownership of ENIC.
Question: How many years were shares of Tottenham Hotspur F.C. listed on the Alternative Investment Market?
Answer: 10