Year	Number of
1990	2303.54
1991	2320.45
1992	2323.75
1993	2318.89
1994	2324
1995	2340.26
1996	2388.77
1997	2459.4
1998	2514.21
1999	2530.13
2000	2576.4
2001	2545.38
2002	2516.04
2003	2497.44
2004	2500.2
2005	2513.53
2006	2515.84
2007	2514.3
2008	2522.86
2009	2505.22
2010	2482.56
2011	2474.13
2012	2448.27
2013	2419.55
2014	2394.55
2015	2374.49
2016	2382.01