Year	Number of
1990	10668.33
1991	11061.24
1992	11422.55
1993	11773.24
1994	12174.76
1995	12541.84
1996	12984.08
1997	13525.64
1998	13981.2
1999	14406.54
2000	14884.32
2001	15347.29
2002	15859.03
2003	16418.15
2004	17010.28
2005	17842.6
2006	18202.87
2007	18728.5
2008	19288.36
2009	20093.82
2010	20879.51
2011	21637.7
2012	22370.48
2013	23395.35
2014	24355.71
2015	25431.27
2016	26516.29