Year	Number
2001	4422831.209710132
2002	5834485.609440546
2003	5908363.545496117
2004	7427824.4047307065
2005	7489497.836280799
2006	7946918.305962168
2007	8224734.580792499
2008	9779564.74641005
2009	10644113.013512801
2010	13439676.349283239
2011	11065512.099260816
2012	11790113.065417541
2013	12106324.920728983
2014	12210720.21837718
2015	11563292.828186348
2016	13028546.968076166
2017	14021098.763986822
2018	17021655.360257573
2019	17409971.529362995