Year	Number of
1990	1967.04
1991	2003.35
1992	2071.53
1993	2111.66
1994	2168.52
1995	2234.96
1996	2280.97
1997	2339.18
1998	2383.01
1999	2485.06
2000	2566.48
2001	2615.61
2002	2699.72
2003	2789.34
2004	2886.84
2005	2980.2
2006	3070.05
2007	3167.27
2008	3281.7
2009	3424.17
2010	3577.01
2011	3726.22
2012	3881.85
2013	4024.99
2014	4196.76
2015	4364.7
2016	4557.6