Year	Number of
1990	1061.56
1991	1132.82
1992	1214.44
1993	1308.03
1994	1415.18
1995	1538.04
1996	1627.3
1997	1724.14
1998	1829.43
1999	1943.64
2000	2067.72
2001	2159.52
2002	2256.58
2003	2361.29
2004	2471.82
2005	2588.89
2006	2722.8
2007	2864.27
2008	3014.55
2009	3175.69
2010	3349.19
2011	3501.19
2012	3665.34
2013	3837.33
2014	4014.9
2015	4196.91
2016	4381.8