Year	Number of
1990	5771.33
1991	6164.46
1992	6598.43
1993	7073.8
1994	7594.29
1995	8165.9
1996	8556.93
1997	8973.43
1998	9414.75
1999	9874
2000	10352.78
2001	10897.12
2002	11469.54
2003	12089.12
2004	12753.76
2005	13479.02
2006	14089.34
2007	14747.14
2008	15465.62
2009	16229.01
2010	17039.25
2011	17910.72
2012	18829.69
2013	19788.74
2014	20802.02
2015	21877.4
2016	22978.79