Year	Number of
1990	607.04
1991	617.64
1992	628.98
1993	641.29
1994	654.81
1995	669.92
1996	676.21
1997	683.9
1998	693.58
1999	703.72
2000	714.4
2001	731.91
2002	750.35
2003	771.51
2004	794.33
2005	819.28
2006	832.46
2007	846.93
2008	864.33
2009	882.82
2010	902.47
2011	933.59
2012	966.66
2013	1002.03
2014	1039.8
2015	1080.18
2016	1122.27